diff --git a/build.gradle b/build.gradle
index 6cc754f..705ee3e 100644
--- a/build.gradle
+++ b/build.gradle
@@ -29,8 +29,8 @@ dependencies {
     // ==============================================================
     implementation 'org.springframework.boot:spring-boot-starter-web'
     implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
-    implementation 'org.springframework.boot:spring-boot-starter-security'
-    implementation 'org.springframework.boot:spring-boot-starter-oauth2-client'
+//    implementation 'org.springframework.boot:spring-boot-starter-security'
+//    implementation 'org.springframework.boot:spring-boot-starter-oauth2-client'
     implementation 'org.springframework.boot:spring-boot-starter-validation'
     implementation 'org.springframework.boot:spring-boot-starter-webflux'
 
@@ -75,6 +75,12 @@ dependencies {
     // ==============================================================
     testImplementation 'org.springframework.boot:spring-boot-starter-test'
     testImplementation 'org.springframework.security:spring-security-test'
+
+    // ==============================================================
+    // 🪣 S3
+    // ==============================================================
+    implementation(platform("software.amazon.awssdk:bom:2.40.11"))
+    implementation("software.amazon.awssdk:s3")
 }
 
 sourceSets {
diff --git a/src/main/java/com/example/pventure/domain/folder/docs/CreateFolderDocs.java b/src/main/java/com/example/pventure/domain/folder/docs/CreateFolderDocs.java
index bedd325..a76bc8e 100644
--- a/src/main/java/com/example/pventure/domain/folder/docs/CreateFolderDocs.java
+++ b/src/main/java/com/example/pventure/domain/folder/docs/CreateFolderDocs.java
@@ -2,7 +2,6 @@
 
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.responses.ApiResponse;
-import io.swagger.v3.oas.annotations.responses.ApiResponses;
 
 import java.lang.annotation.*;
 
@@ -13,9 +12,7 @@
         summary = FolderSwaggerDocs.CREATE_SUMMARY,
         description = FolderSwaggerDocs.CREATE_DESCRIPTION
 )
-@ApiResponses({
-        @ApiResponse(responseCode = "201", description = "생성 성공", useReturnTypeSchema = true),
-        @ApiResponse(responseCode = "400", description = "잘못된 요청"),
-        @ApiResponse(responseCode = "409", description = "기본 폴더 중복")
-})
-public @interface CreateFolderDocs {}
+@ApiResponse(responseCode = "201", description = "생성 성공", useReturnTypeSchema = true)
+@ApiResponse(responseCode = "400", description = "잘못된 요청")
+@ApiResponse(responseCode = "409", description = "기본 폴더 중복")
+public @interface CreateFolderDocs {}
\ No newline at end of file
diff --git a/src/main/java/com/example/pventure/domain/folder/docs/DeleteFolderDocs.java b/src/main/java/com/example/pventure/domain/folder/docs/DeleteFolderDocs.java
index ba97dca..db6701c 100644
--- a/src/main/java/com/example/pventure/domain/folder/docs/DeleteFolderDocs.java
+++ b/src/main/java/com/example/pventure/domain/folder/docs/DeleteFolderDocs.java
@@ -2,7 +2,6 @@
 
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.responses.ApiResponse;
-import io.swagger.v3.oas.annotations.responses.ApiResponses;
 
 import java.lang.annotation.*;
 
@@ -13,8 +12,6 @@
         summary = FolderSwaggerDocs.DELETE_SUMMARY,
         description = FolderSwaggerDocs.DELETE_DESCRIPTION
 )
-@ApiResponses({
-        @ApiResponse(responseCode = "204", description = "삭제 성공"),
-        @ApiResponse(responseCode = "404", description = "폴더 또는 사용자 없음")
-})
+@ApiResponse(responseCode = "204", description = "삭제 성공")
+@ApiResponse(responseCode = "404", description = "폴더 또는 사용자 없음")
 public @interface DeleteFolderDocs {}
diff --git a/src/main/java/com/example/pventure/domain/folder/docs/GetFolderDocs.java b/src/main/java/com/example/pventure/domain/folder/docs/GetFolderDocs.java
index 449804d..bf27e13 100644
--- a/src/main/java/com/example/pventure/domain/folder/docs/GetFolderDocs.java
+++ b/src/main/java/com/example/pventure/domain/folder/docs/GetFolderDocs.java
@@ -2,7 +2,6 @@
 
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.responses.ApiResponse;
-import io.swagger.v3.oas.annotations.responses.ApiResponses;
 
 import java.lang.annotation.*;
 
@@ -13,8 +12,6 @@
         summary = FolderSwaggerDocs.DETAIL_SUMMARY,
         description = FolderSwaggerDocs.DETAIL_DESCRIPTION
 )
-@ApiResponses({
-        @ApiResponse(responseCode = "200", description = "조회 성공", useReturnTypeSchema = true),
-        @ApiResponse(responseCode = "404", description = "폴더 또는 사용자 없음")
-})
+@ApiResponse(responseCode = "200", description = "조회 성공", useReturnTypeSchema = true)
+@ApiResponse(responseCode = "404", description = "폴더 또는 사용자 없음")
 public @interface GetFolderDocs {}
diff --git a/src/main/java/com/example/pventure/domain/folder/docs/GetFoldersDocs.java b/src/main/java/com/example/pventure/domain/folder/docs/GetFoldersDocs.java
index f64f262..c1a549d 100644
--- a/src/main/java/com/example/pventure/domain/folder/docs/GetFoldersDocs.java
+++ b/src/main/java/com/example/pventure/domain/folder/docs/GetFoldersDocs.java
@@ -2,7 +2,6 @@
 
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.responses.ApiResponse;
-import io.swagger.v3.oas.annotations.responses.ApiResponses;
 
 import java.lang.annotation.*;
 
@@ -13,8 +12,6 @@
         summary = FolderSwaggerDocs.GET_ALL_SUMMARY,
         description = FolderSwaggerDocs.GET_ALL_DESCRIPTION
 )
-@ApiResponses({
-        @ApiResponse(responseCode = "200", description = "조회 성공", useReturnTypeSchema = true),
-        @ApiResponse(responseCode = "404", description = "사용자 없음")
-})
+@ApiResponse(responseCode = "200", description = "조회 성공", useReturnTypeSchema = true)
+@ApiResponse(responseCode = "404", description = "사용자 없음")
 public @interface GetFoldersDocs {}
diff --git a/src/main/java/com/example/pventure/domain/folder/docs/UpdateFolderDocs.java b/src/main/java/com/example/pventure/domain/folder/docs/UpdateFolderDocs.java
index 6862258..c8c1091 100644
--- a/src/main/java/com/example/pventure/domain/folder/docs/UpdateFolderDocs.java
+++ b/src/main/java/com/example/pventure/domain/folder/docs/UpdateFolderDocs.java
@@ -2,7 +2,6 @@
 
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.responses.ApiResponse;
-import io.swagger.v3.oas.annotations.responses.ApiResponses;
 
 import java.lang.annotation.*;
 
@@ -13,8 +12,6 @@
         summary = FolderSwaggerDocs.UPDATE_SUMMARY,
         description = FolderSwaggerDocs.UPDATE_DESCRIPTION
 )
-@ApiResponses({
-        @ApiResponse(responseCode = "200", description = "수정 성공", useReturnTypeSchema = true),
-        @ApiResponse(responseCode = "404", description = "폴더 또는 사용자 없음")
-})
+@ApiResponse(responseCode = "200", description = "수정 성공", useReturnTypeSchema = true)
+@ApiResponse(responseCode = "404", description = "폴더 또는 사용자 없음")
 public @interface UpdateFolderDocs {}
diff --git a/src/main/java/com/example/pventure/domain/photo/controller/PhotoController.java b/src/main/java/com/example/pventure/domain/photo/controller/PhotoController.java
new file mode 100644
index 0000000..90e6e36
--- /dev/null
+++ b/src/main/java/com/example/pventure/domain/photo/controller/PhotoController.java
@@ -0,0 +1,113 @@
+package com.example.pventure.domain.photo.controller;
+
+import com.example.pventure.domain.photo.docs.CreatePhotosDocs;
+import com.example.pventure.domain.photo.docs.DeletePhotosDocs;
+import com.example.pventure.domain.photo.docs.GenerateUploadUrlsDocs;
+import com.example.pventure.domain.photo.docs.GetPhotoDocs;
+import com.example.pventure.domain.photo.docs.GetPhotosByAlbumDocs;
+import com.example.pventure.domain.photo.docs.GetUnassignedPhotosDocs;
+import com.example.pventure.domain.photo.docs.MovePhotosDocs;
+import com.example.pventure.domain.photo.dto.request.MovePhotoRequestDto;
+import com.example.pventure.domain.photo.dto.request.PhotoRequestDto;
+import com.example.pventure.domain.photo.dto.request.UploadUrlRequestDto;
+import com.example.pventure.domain.photo.dto.response.PhotoDetailResponseDto;
+import com.example.pventure.domain.photo.dto.response.PhotoResponseDto;
+import com.example.pventure.domain.photo.dto.response.UploadUrlResponseDto;
+import com.example.pventure.domain.photo.service.PhotoService;
+import com.example.pventure.global.response.CustomResponse;
+import com.example.pventure.global.response.CustomResponseHelper;
+import io.swagger.v3.oas.annotations.tags.Tag;
+import jakarta.validation.Valid;
+import java.util.List;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.PutMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+@Tag(name = "Photo", description = "사진 관련 API")
+@RestController
+@RequestMapping("/trips/{tripId}")
+@RequiredArgsConstructor
+public class PhotoController {
+
+    private final PhotoService photoService;
+
+    @GenerateUploadUrlsDocs
+    @PostMapping("/photos/upload-urls")
+    public ResponseEntity<CustomResponse<List<UploadUrlResponseDto>>> generateUploadUrls(
+        @RequestParam Long userId,
+        @PathVariable Long tripId,
+        @Valid @RequestBody List<UploadUrlRequestDto> requestDtos
+    ) {
+        return CustomResponseHelper.ok(photoService.generateUploadUrls(userId, tripId, requestDtos));
+    }
+
+    @CreatePhotosDocs
+    @PostMapping("/photos")
+    public ResponseEntity<CustomResponse<List<PhotoResponseDto>>> createPhotos(
+        @RequestParam Long userId,
+        @PathVariable Long tripId,
+        @RequestParam(required = false) Long albumId,
+        @Valid @RequestBody List<PhotoRequestDto> requestDtos
+    ) {
+        return CustomResponseHelper.created(photoService.createPhotos(userId, tripId, albumId, requestDtos));
+    }
+
+    @GetPhotosByAlbumDocs
+    @GetMapping("/albums/{albumId}/photos")
+    public ResponseEntity<CustomResponse<List<PhotoResponseDto>>> getPhotosByAlbum(
+        @RequestParam Long userId,
+        @PathVariable Long tripId,
+        @PathVariable Long albumId
+    ) {
+        return CustomResponseHelper.ok(photoService.getPhotosByAlbum(userId, tripId, albumId));
+    }
+
+    @GetUnassignedPhotosDocs
+    @GetMapping("/photos/unassigned")
+    public ResponseEntity<CustomResponse<List<PhotoResponseDto>>> getUnassignedPhotos(
+        @RequestParam Long userId,
+        @PathVariable Long tripId
+    ) {
+        return CustomResponseHelper.ok(photoService.getUnassignedPhotos(userId, tripId));
+    }
+
+    @GetPhotoDocs
+    @GetMapping("/photos/{photoId}")
+    public ResponseEntity<CustomResponse<PhotoDetailResponseDto>> getPhoto(
+        @RequestParam Long userId,
+        @PathVariable Long tripId,
+        @PathVariable Long photoId
+    ) {
+        return CustomResponseHelper.ok(photoService.getPhoto(userId, tripId, photoId));
+    }
+
+    @MovePhotosDocs
+    @PutMapping("/photos/move")
+    public ResponseEntity<Void> movePhotos(
+        @RequestParam Long userId,
+        @PathVariable Long tripId,
+        @Valid @RequestBody MovePhotoRequestDto requestDto
+    ) {
+        photoService.movePhotos(userId, tripId, requestDto.getTargetAlbumId(), requestDto.getPhotoIds());
+        return CustomResponseHelper.noContent();
+    }
+
+    @DeletePhotosDocs
+    @DeleteMapping("/photos")
+    public ResponseEntity<Void> deletePhotos(
+        @RequestParam Long userId,
+        @PathVariable Long tripId,
+        @RequestParam List<Long> photoIds
+    ) {
+        photoService.deletePhotos(userId, tripId, photoIds);
+        return CustomResponseHelper.noContent();
+    }
+}
diff --git a/src/main/java/com/example/pventure/domain/photo/controller/README.md b/src/main/java/com/example/pventure/domain/photo/controller/README.md
deleted file mode 100644
index 4af3b3f..0000000
--- a/src/main/java/com/example/pventure/domain/photo/controller/README.md
+++ /dev/null
@@ -1 +0,0 @@
-# Photo 관련 API 엔드포인트 정의
\ No newline at end of file
diff --git a/src/main/java/com/example/pventure/domain/photo/docs/CreatePhotosDocs.java b/src/main/java/com/example/pventure/domain/photo/docs/CreatePhotosDocs.java
new file mode 100644
index 0000000..b195e30
--- /dev/null
+++ b/src/main/java/com/example/pventure/domain/photo/docs/CreatePhotosDocs.java
@@ -0,0 +1,22 @@
+package com.example.pventure.domain.photo.docs;
+
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.responses.ApiResponse;
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Documented
+@Target(ElementType.METHOD)
+@Retention(RetentionPolicy.RUNTIME)
+@Operation(
+    summary = PhotoSwaggerDocs.CREATE_PHOTOS_SUMMARY,
+    description = PhotoSwaggerDocs.CREATE_PHOTOS_DESCRIPTION
+)
+@ApiResponse(responseCode = "201", description = "사진 생성 성공", useReturnTypeSchema = true)
+@ApiResponse(responseCode = "400", description = "잘못된 요청")
+@ApiResponse(responseCode = "403", description = "편집 권한 없음")
+@ApiResponse(responseCode = "404", description = "사용자 또는 여행 없음")
+public @interface CreatePhotosDocs {}
\ No newline at end of file
diff --git a/src/main/java/com/example/pventure/domain/photo/docs/DeletePhotosDocs.java b/src/main/java/com/example/pventure/domain/photo/docs/DeletePhotosDocs.java
new file mode 100644
index 0000000..1fa6adc
--- /dev/null
+++ b/src/main/java/com/example/pventure/domain/photo/docs/DeletePhotosDocs.java
@@ -0,0 +1,21 @@
+package com.example.pventure.domain.photo.docs;
+
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.responses.ApiResponse;
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Documented
+@Target(ElementType.METHOD)
+@Retention(RetentionPolicy.RUNTIME)
+@Operation(
+    summary = PhotoSwaggerDocs.DELETE_PHOTO_SUMMARY,
+    description = PhotoSwaggerDocs.DELETE_PHOTO_DESCRIPTION
+)
+@ApiResponse(responseCode = "204", description = "삭제 성공")
+@ApiResponse(responseCode = "403", description = "편집 권한 없음")
+@ApiResponse(responseCode = "404", description = "사용자 또는 여행 또는 사진 없음")
+public @interface DeletePhotosDocs {}
diff --git a/src/main/java/com/example/pventure/domain/photo/docs/GenerateUploadUrlsDocs.java b/src/main/java/com/example/pventure/domain/photo/docs/GenerateUploadUrlsDocs.java
new file mode 100644
index 0000000..332a8c5
--- /dev/null
+++ b/src/main/java/com/example/pventure/domain/photo/docs/GenerateUploadUrlsDocs.java
@@ -0,0 +1,22 @@
+package com.example.pventure.domain.photo.docs;
+
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.responses.ApiResponse;
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Documented
+@Target(ElementType.METHOD)
+@Retention(RetentionPolicy.RUNTIME)
+@Operation(
+    summary = PhotoSwaggerDocs.GENERATE_UPLOAD_URLS_SUMMARY,
+    description = PhotoSwaggerDocs.GENERATE_UPLOAD_URLS_DESCRIPTION
+)
+@ApiResponse(responseCode = "200", description = "업로드 URL 생성 성공", useReturnTypeSchema = true)
+@ApiResponse(responseCode = "400", description = "잘못된 요청")
+@ApiResponse(responseCode = "403", description = "편집 권한 없음")
+@ApiResponse(responseCode = "404", description = "사용자 또는 여행 없음")
+public @interface GenerateUploadUrlsDocs {}
\ No newline at end of file
diff --git a/src/main/java/com/example/pventure/domain/photo/docs/GetPhotoDocs.java b/src/main/java/com/example/pventure/domain/photo/docs/GetPhotoDocs.java
new file mode 100644
index 0000000..03d27cd
--- /dev/null
+++ b/src/main/java/com/example/pventure/domain/photo/docs/GetPhotoDocs.java
@@ -0,0 +1,21 @@
+package com.example.pventure.domain.photo.docs;
+
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.responses.ApiResponse;
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Documented
+@Target(ElementType.METHOD)
+@Retention(RetentionPolicy.RUNTIME)
+@Operation(
+    summary = PhotoSwaggerDocs.GET_PHOTO_SUMMARY,
+    description = PhotoSwaggerDocs.GET_PHOTO_DESCRIPTION
+)
+@ApiResponse(responseCode = "200", description = "조회 성공", useReturnTypeSchema = true)
+@ApiResponse(responseCode = "403", description = "보기 권한 없음")
+@ApiResponse(responseCode = "404", description = "사용자 또는 여행 또는 사진 없음")
+public @interface GetPhotoDocs {}
\ No newline at end of file
diff --git a/src/main/java/com/example/pventure/domain/photo/docs/GetPhotosByAlbumDocs.java b/src/main/java/com/example/pventure/domain/photo/docs/GetPhotosByAlbumDocs.java
new file mode 100644
index 0000000..6051e73
--- /dev/null
+++ b/src/main/java/com/example/pventure/domain/photo/docs/GetPhotosByAlbumDocs.java
@@ -0,0 +1,21 @@
+package com.example.pventure.domain.photo.docs;
+
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.responses.ApiResponse;
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Documented
+@Target(ElementType.METHOD)
+@Retention(RetentionPolicy.RUNTIME)
+@Operation(
+    summary = PhotoSwaggerDocs.GET_PHOTOS_BY_ALBUM_SUMMARY,
+    description = PhotoSwaggerDocs.GET_PHOTOS_BY_ALBUM_DESCRIPTION
+)
+@ApiResponse(responseCode = "200", description = "조회 성공", useReturnTypeSchema = true)
+@ApiResponse(responseCode = "403", description = "보기 권한 없음")
+@ApiResponse(responseCode = "404", description = "사용자 또는 여행 없음")
+public @interface GetPhotosByAlbumDocs {}
\ No newline at end of file
diff --git a/src/main/java/com/example/pventure/domain/photo/docs/GetUnassignedPhotosDocs.java b/src/main/java/com/example/pventure/domain/photo/docs/GetUnassignedPhotosDocs.java
new file mode 100644
index 0000000..2b45790
--- /dev/null
+++ b/src/main/java/com/example/pventure/domain/photo/docs/GetUnassignedPhotosDocs.java
@@ -0,0 +1,21 @@
+package com.example.pventure.domain.photo.docs;
+
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.responses.ApiResponse;
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Documented
+@Target(ElementType.METHOD)
+@Retention(RetentionPolicy.RUNTIME)
+@Operation(
+    summary = PhotoSwaggerDocs.GET_UNASSIGNED_PHOTOS_SUMMARY,
+    description = PhotoSwaggerDocs.GET_UNASSIGNED_PHOTOS_DESCRIPTION
+)
+@ApiResponse(responseCode = "200", description = "조회 성공", useReturnTypeSchema = true)
+@ApiResponse(responseCode = "403", description = "보기 권한 없음")
+@ApiResponse(responseCode = "404", description = "사용자 또는 여행 없음")
+public @interface GetUnassignedPhotosDocs {}
\ No newline at end of file
diff --git a/src/main/java/com/example/pventure/domain/photo/docs/MovePhotosDocs.java b/src/main/java/com/example/pventure/domain/photo/docs/MovePhotosDocs.java
new file mode 100644
index 0000000..bd9a449
--- /dev/null
+++ b/src/main/java/com/example/pventure/domain/photo/docs/MovePhotosDocs.java
@@ -0,0 +1,22 @@
+package com.example.pventure.domain.photo.docs;
+
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.responses.ApiResponse;
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Documented
+@Target(ElementType.METHOD)
+@Retention(RetentionPolicy.RUNTIME)
+@Operation(
+    summary = PhotoSwaggerDocs.MOVE_PHOTOS_SUMMARY,
+    description = PhotoSwaggerDocs.MOVE_PHOTOS_DESCRIPTION
+)
+@ApiResponse(responseCode = "200", description = "이동 성공", useReturnTypeSchema = true)
+@ApiResponse(responseCode = "400", description = "잘못된 요청")
+@ApiResponse(responseCode = "403", description = "편집 권한 없음")
+@ApiResponse(responseCode = "404", description = "사용자 또는 여행 또는 사진 없음")
+public @interface MovePhotosDocs {}
\ No newline at end of file
diff --git a/src/main/java/com/example/pventure/domain/photo/docs/PhotoSwaggerDocs.java b/src/main/java/com/example/pventure/domain/photo/docs/PhotoSwaggerDocs.java
new file mode 100644
index 0000000..c1744b0
--- /dev/null
+++ b/src/main/java/com/example/pventure/domain/photo/docs/PhotoSwaggerDocs.java
@@ -0,0 +1,40 @@
+package com.example.pventure.domain.photo.docs;
+
+import lombok.AccessLevel;
+import lombok.NoArgsConstructor;
+
+@NoArgsConstructor(access = AccessLevel.PRIVATE)
+public class PhotoSwaggerDocs {
+
+    // --- Generate Upload Presigned Urls ---
+    public static final String GENERATE_UPLOAD_URLS_SUMMARY = "사진 업로드용 Presigned URL 생성";
+    public static final String GENERATE_UPLOAD_URLS_DESCRIPTION = "사진을 업로드하기 위한 S3 Presigned-URL 목록을 생성합니다.";
+
+    // --- Create ---
+    public static final String CREATE_PHOTOS_SUMMARY = "사진 저장";
+    public static final String CREATE_PHOTOS_DESCRIPTION =
+        "클라이언트가 S3 업로드를 완료한 뒤, 사용자 ID, 여행 ID, 앨범 ID, 사진 정보(s3Key, 파일 정보 등)를 저장합니다.";
+    
+    // --- Get Photos By Album---
+    public static final String GET_PHOTOS_BY_ALBUM_SUMMARY = "앨범별 사진 목록 조회";
+    public static final String GET_PHOTOS_BY_ALBUM_DESCRIPTION = "사용자 ID, 여행 ID, 앨범 ID로 특정 앨범에 포함된 사진 목록을 조회합니다. "
+        + "목록 조회 시 사진 ID와 다운로드용 Presigned URL만 반환합니다.";
+
+    // --- Get Unassigned Photos ---
+    public static final String GET_UNASSIGNED_PHOTOS_SUMMARY = "미분류 사진 목록 조회";
+    public static final String GET_UNASSIGNED_PHOTOS_DESCRIPTION =
+        "사용자 ID, 여행 ID로 앨범이 지정되지 않은(Album = null) 사진 목록을 조회합니다. "
+            + "목록 조회 시 사진 ID와 다운로드용 Presigned URL만 반환합니다.";
+
+    // --- Get Photo ---
+    public static final String GET_PHOTO_SUMMARY = "사진 상세 조회";
+    public static final String GET_PHOTO_DESCRIPTION = "사용자 ID, 여행 ID, 사진 ID로 특정 사진의 상세 정보를 조회합니다.";
+    
+    // --- Move Photos ---
+    public static final String MOVE_PHOTOS_SUMMARY = "사진 일괄 이동";
+    public static final String MOVE_PHOTOS_DESCRIPTION = "선택한 사진을 특정 앨범으로 일괄 이동합니다. ";
+
+    // --- Delete Photos ---
+    public static final String DELETE_PHOTO_SUMMARY = "사진 일괄 삭제";
+    public static final String DELETE_PHOTO_DESCRIPTION = "선택한 사진을 DB와 S3에서 일괄 삭제합니다.";
+}
diff --git a/src/main/java/com/example/pventure/domain/photo/dto/request/MovePhotoRequestDto.java b/src/main/java/com/example/pventure/domain/photo/dto/request/MovePhotoRequestDto.java
new file mode 100644
index 0000000..5da9a99
--- /dev/null
+++ b/src/main/java/com/example/pventure/domain/photo/dto/request/MovePhotoRequestDto.java
@@ -0,0 +1,22 @@
+package com.example.pventure.domain.photo.dto.request;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+import jakarta.validation.constraints.NotEmpty;
+import java.util.List;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Getter
+@NoArgsConstructor
+@AllArgsConstructor
+@Schema(description = "사진 이동 요청 DTO")
+public class MovePhotoRequestDto {
+
+    @Schema(description = "이동할 사진 ID 목록", example = "[1, 2, 3]")
+    @NotEmpty(message = "이동할 사진 ID 목록은 필수입니다.")
+    private List<Long> photoIds;
+
+    @Schema(description = "이동 대상 앨범 ID (null이면 앨범 미지정)", example = "1", nullable = true)
+    private Long targetAlbumId;
+}
\ No newline at end of file
diff --git a/src/main/java/com/example/pventure/domain/photo/dto/request/PhotoRequestDto.java b/src/main/java/com/example/pventure/domain/photo/dto/request/PhotoRequestDto.java
new file mode 100644
index 0000000..a697bfc
--- /dev/null
+++ b/src/main/java/com/example/pventure/domain/photo/dto/request/PhotoRequestDto.java
@@ -0,0 +1,51 @@
+package com.example.pventure.domain.photo.dto.request;
+
+import com.example.pventure.domain.album.entity.Album;
+import com.example.pventure.domain.photo.entity.Photo;
+import com.example.pventure.domain.trip.entity.Trip;
+import com.example.pventure.domain.user.entity.User;
+import io.swagger.v3.oas.annotations.media.Schema;
+import jakarta.validation.constraints.Min;
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.NotNull;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Getter
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+@Schema(description = "S3 업로드 완료 후 사진 생성 요청 DTO")
+public class PhotoRequestDto {
+
+    @Schema(description = "S3 Key", example = "trips/1/photos/uuid_IMG_1234.JPG")
+    @NotBlank(message = "S3 키 값을 입력해주세요.")
+    private String s3Key;
+
+    @Schema(description = "원본 파일명", example = "IMG_1234.JPG")
+    @NotBlank(message = "파일명을 입력해주세요.")
+    private String originalFileName;
+
+    @Schema(description = "파일 유형", example = "image/jpeg")
+    @NotBlank(message = "파일 유형을 입력해주세요.")
+    private String contentType;
+
+    @Schema(description = "파일 크기", example = "345678")
+    @NotNull(message = "파일 크기를 입력해주세요.")
+    @Min(value = 1, message = "파일 크기는 1바이트 이상이어야 합니다.")
+    private Long fileSize;
+
+    public Photo toEntity(Trip trip, Album album, User user) {
+        return Photo.builder()
+            .trip(trip)
+            .album(album)
+            .uploader(user)
+            .s3Key(s3Key)
+            .originalFileName(originalFileName)
+            .contentType(contentType)
+            .fileSize(fileSize)
+            .build();
+    }
+}
diff --git a/src/main/java/com/example/pventure/domain/photo/dto/request/README.md b/src/main/java/com/example/pventure/domain/photo/dto/request/README.md
deleted file mode 100644
index 048ee03..0000000
--- a/src/main/java/com/example/pventure/domain/photo/dto/request/README.md
+++ /dev/null
@@ -1 +0,0 @@
-# Photo 관련 API 요청 DTO
\ No newline at end of file
diff --git a/src/main/java/com/example/pventure/domain/photo/dto/request/UploadUrlRequestDto.java b/src/main/java/com/example/pventure/domain/photo/dto/request/UploadUrlRequestDto.java
new file mode 100644
index 0000000..fd57e22
--- /dev/null
+++ b/src/main/java/com/example/pventure/domain/photo/dto/request/UploadUrlRequestDto.java
@@ -0,0 +1,32 @@
+package com.example.pventure.domain.photo.dto.request;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+import jakarta.validation.constraints.Min;
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.NotNull;
+import jakarta.validation.constraints.Pattern;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Getter
+@NoArgsConstructor
+@AllArgsConstructor
+@Schema(description = "S3 업로드용 Presigned URL 생성 요청 DTO")
+public class UploadUrlRequestDto {
+
+    @Schema(description = "원본 파일명", example = "IMG_1234.JPG")
+    @NotBlank(message = "파일명을 입력해주세요.")
+    private String originalFileName;
+
+    @Schema(description = "파일 유형", example = "image/jpeg")
+    @NotBlank(message = "파일 유형을 입력해주세요.")
+    @Pattern(regexp = "^image/(jpeg|jpg|png|webp)$", message = "지원되는 이미지 형식이 아닙니다.")
+    private String contentType;
+
+    @Schema(description = "파일 크기(Byte)", example = "345678")
+    @NotNull(message = "파일 크기를 입력해주세요.")
+    @Min(value = 1, message = "파일 크기는 1바이트 이상이어야 합니다.")
+    private Long fileSize;
+
+}
\ No newline at end of file
diff --git a/src/main/java/com/example/pventure/domain/photo/dto/response/PhotoDetailResponseDto.java b/src/main/java/com/example/pventure/domain/photo/dto/response/PhotoDetailResponseDto.java
new file mode 100644
index 0000000..830c6e0
--- /dev/null
+++ b/src/main/java/com/example/pventure/domain/photo/dto/response/PhotoDetailResponseDto.java
@@ -0,0 +1,57 @@
+package com.example.pventure.domain.photo.dto.response;
+
+import com.example.pventure.domain.photo.entity.Photo;
+import com.example.pventure.domain.user.entity.User;
+import io.swagger.v3.oas.annotations.media.Schema;
+import java.time.LocalDateTime;
+import java.util.Optional;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Getter
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+@Schema(description = "사진 상세 조회 응답 DTO")
+public class PhotoDetailResponseDto {
+
+    @Schema(description = "사진 ID", example = "1")
+    private Long id;
+
+    @Schema(
+        description = "사진 조회용 Presigned URL",
+        example = "https://bucket.s3.ap-northeast-2.amazonaws.com/photos/...?...X-Amz-Signature=..."
+    )
+    private String downloadUrl;
+
+    @Schema(description = "업로더 이름", example = "홍길동")
+    private String uploaderName;
+
+    @Schema(description = "원본 파일명", example = "IMG_1234.JPG")
+    private String originalFileName;
+
+    @Schema(description = "파일 유형", example = "image/jpeg")
+    private String contentType;
+
+    @Schema(description = "파일 크기(Byte)", example = "345678")
+    private Long fileSize;
+
+    @Schema(description = "업로드 시각", example = "2025-12-25T10:00:00")
+    private LocalDateTime createdAt;
+
+    public static PhotoDetailResponseDto from (Photo photo, String downloadUrl) {
+        return PhotoDetailResponseDto.builder()
+            .id(photo.getId())
+            .downloadUrl(downloadUrl)
+            .uploaderName(Optional.ofNullable(photo.getUploader())
+                .map(User::getName)
+                .orElse("Unknown"))
+            .originalFileName(photo.getOriginalFileName())
+            .contentType(photo.getContentType())
+            .fileSize(photo.getFileSize())
+            .createdAt(photo.getCreatedAt())
+            .build();
+    }
+}
diff --git a/src/main/java/com/example/pventure/domain/photo/dto/response/PhotoResponseDto.java b/src/main/java/com/example/pventure/domain/photo/dto/response/PhotoResponseDto.java
new file mode 100644
index 0000000..12f50ef
--- /dev/null
+++ b/src/main/java/com/example/pventure/domain/photo/dto/response/PhotoResponseDto.java
@@ -0,0 +1,32 @@
+package com.example.pventure.domain.photo.dto.response;
+
+import com.example.pventure.domain.photo.entity.Photo;
+import io.swagger.v3.oas.annotations.media.Schema;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Getter
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+@Schema(description = "사진 목록 조회 응답 DTO")
+public class PhotoResponseDto {
+
+    @Schema(description = "사진 ID", example = "1")
+    private Long id;
+
+    @Schema(
+        description = "사진 조회용 Presigned URL",
+        example = "https://bucket.s3.ap-northeast-2.amazonaws.com/photos/...?...X-Amz-Signature=..."
+    )
+    private String downloadUrl;
+
+    public static PhotoResponseDto from (Photo photo, String downloadUrl) {
+        return PhotoResponseDto.builder()
+            .id(photo.getId())
+            .downloadUrl(downloadUrl)
+            .build();
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/com/example/pventure/domain/photo/dto/response/README.md b/src/main/java/com/example/pventure/domain/photo/dto/response/README.md
deleted file mode 100644
index 7a9a635..0000000
--- a/src/main/java/com/example/pventure/domain/photo/dto/response/README.md
+++ /dev/null
@@ -1 +0,0 @@
-# Photo 관련 API 응답 DTO
\ No newline at end of file
diff --git a/src/main/java/com/example/pventure/domain/photo/dto/response/UploadUrlResponseDto.java b/src/main/java/com/example/pventure/domain/photo/dto/response/UploadUrlResponseDto.java
new file mode 100644
index 0000000..c348fc4
--- /dev/null
+++ b/src/main/java/com/example/pventure/domain/photo/dto/response/UploadUrlResponseDto.java
@@ -0,0 +1,30 @@
+package com.example.pventure.domain.photo.dto.response;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Getter
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+@Schema(description = "사진 업로드용 Presigned URL 응답 DTO")
+public class UploadUrlResponseDto {
+
+    @Schema(
+        description = "업로드할 객체의 S3 키",
+        example = "trips/1/photos/uuid_IMG_1234.JPG"
+    )
+    private String s3Key;
+
+    @Schema(
+        description = "사진 업로드용 Presigned URL",
+        example = "https://bucket.s3.ap-northeast-2.amazonaws.com/photos/...?...X-Amz-Signature=..."
+    )
+    private String uploadUrl;
+
+    @Schema(description = "원본 파일명", example = "IMG_1234.JPG")
+    private String originalFileName;
+}
diff --git a/src/main/java/com/example/pventure/domain/photo/entity/Photo.java b/src/main/java/com/example/pventure/domain/photo/entity/Photo.java
index 406bf33..4c2a06a 100644
--- a/src/main/java/com/example/pventure/domain/photo/entity/Photo.java
+++ b/src/main/java/com/example/pventure/domain/photo/entity/Photo.java
@@ -1,6 +1,8 @@
 package com.example.pventure.domain.photo.entity;
 
 import com.example.pventure.domain.album.entity.Album;
+import com.example.pventure.domain.trip.entity.Trip;
+import com.example.pventure.domain.user.entity.User;
 import com.example.pventure.global.entity.BaseEntity;
 import jakarta.persistence.*;
 import lombok.*;
@@ -13,12 +15,34 @@
 public class Photo extends BaseEntity {
 
     @ManyToOne(fetch = FetchType.LAZY)
-    @JoinColumn(name = "album_id", nullable = false)
+    @JoinColumn(name = "trip_id", nullable = false)
+    private Trip trip;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "album_id")
     private Album album;
 
-    @Column(nullable = false,columnDefinition = "TEXT")
-    private String url;
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "uploader_id", nullable = false)
+    private User uploader;
+
+    @Column(nullable = false)
+    private String originalFileName;
+
+    @Column(nullable = false)
+    private String contentType;
+
+    @Column(nullable = false)
+    private Long fileSize;
+
+    @Column(nullable = false)
+    private String s3Key;
+
+    public void updateAlbum(Album album) {
+        this.album = album;
+    }
 
-    @Column(length = 100)
-    private String caption;
+    public void removeAlbum() {
+        this.album = null;
+    }
 }
diff --git a/src/main/java/com/example/pventure/domain/photo/repository/PhotoRepository.java b/src/main/java/com/example/pventure/domain/photo/repository/PhotoRepository.java
index 202a0f6..bb2e37b 100644
--- a/src/main/java/com/example/pventure/domain/photo/repository/PhotoRepository.java
+++ b/src/main/java/com/example/pventure/domain/photo/repository/PhotoRepository.java
@@ -1,7 +1,22 @@
 package com.example.pventure.domain.photo.repository;
 
+import com.example.pventure.domain.album.entity.Album;
 import com.example.pventure.domain.photo.entity.Photo;
+import com.example.pventure.domain.trip.entity.Trip;
+import java.util.List;
+import java.util.Optional;
+import java.util.Set;
 import org.springframework.data.jpa.repository.JpaRepository;
 
 public interface PhotoRepository extends JpaRepository<Photo, Long> {
+
+    List<Photo> findAllByAlbum(Album album);
+
+    List<Photo> findAllByTripAndAlbumIsNull(Trip trip);
+
+    List<Photo> findAllByIdInAndTrip(Set<Long> id, Trip trip);
+
+    Optional<Photo> findByIdAndTrip(Long id, Trip trip);
+
+    Long countByAlbum(Album album);
 }
diff --git a/src/main/java/com/example/pventure/domain/photo/repository/README.md b/src/main/java/com/example/pventure/domain/photo/repository/README.md
deleted file mode 100644
index 5fc88d6..0000000
--- a/src/main/java/com/example/pventure/domain/photo/repository/README.md
+++ /dev/null
@@ -1 +0,0 @@
-# Photo 관련 DB 접근
\ No newline at end of file
diff --git a/src/main/java/com/example/pventure/domain/photo/service/PhotoService.java b/src/main/java/com/example/pventure/domain/photo/service/PhotoService.java
new file mode 100644
index 0000000..8c052b2
--- /dev/null
+++ b/src/main/java/com/example/pventure/domain/photo/service/PhotoService.java
@@ -0,0 +1,28 @@
+package com.example.pventure.domain.photo.service;
+
+import com.example.pventure.domain.album.entity.Album;
+import com.example.pventure.domain.photo.dto.request.PhotoRequestDto;
+import com.example.pventure.domain.photo.dto.request.UploadUrlRequestDto;
+import com.example.pventure.domain.photo.dto.response.PhotoDetailResponseDto;
+import com.example.pventure.domain.photo.dto.response.PhotoResponseDto;
+import com.example.pventure.domain.photo.dto.response.UploadUrlResponseDto;
+import java.util.List;
+
+public interface PhotoService {
+
+    List<UploadUrlResponseDto> generateUploadUrls(Long userId, Long tripId, List<UploadUrlRequestDto> requestDtos);
+
+    List<PhotoResponseDto> createPhotos(Long userId, Long tripId, Long albumId, List<PhotoRequestDto> requestDtos);
+
+    List<PhotoResponseDto> getPhotosByAlbum(Long userId, Long tripId, Long albumId);
+
+    List<PhotoResponseDto> getUnassignedPhotos(Long userId, Long tripId);
+
+    PhotoDetailResponseDto getPhoto(Long userId, Long tripId, Long photoId);
+
+    void movePhotos(Long userId, Long tripId, Long targetAlbumId, List<Long> albumIds);
+
+    void deletePhotos(Long userId, Long tripId, List<Long> photoIds);
+
+    Long countPhotos(Album album);
+}
diff --git a/src/main/java/com/example/pventure/domain/photo/service/PhotoServiceImpl.java b/src/main/java/com/example/pventure/domain/photo/service/PhotoServiceImpl.java
new file mode 100644
index 0000000..c45e106
--- /dev/null
+++ b/src/main/java/com/example/pventure/domain/photo/service/PhotoServiceImpl.java
@@ -0,0 +1,203 @@
+package com.example.pventure.domain.photo.service;
+
+import com.example.pventure.domain.album.entity.Album;
+import com.example.pventure.domain.album.repository.AlbumRepository;
+import com.example.pventure.domain.photo.dto.request.PhotoRequestDto;
+import com.example.pventure.domain.photo.dto.request.UploadUrlRequestDto;
+import com.example.pventure.domain.photo.dto.response.PhotoDetailResponseDto;
+import com.example.pventure.domain.photo.dto.response.PhotoResponseDto;
+import com.example.pventure.domain.photo.dto.response.UploadUrlResponseDto;
+import com.example.pventure.domain.photo.entity.Photo;
+import com.example.pventure.domain.photo.repository.PhotoRepository;
+import com.example.pventure.domain.trip.entity.Trip;
+import com.example.pventure.domain.trip.repository.TripRepository;
+import com.example.pventure.domain.trip.service.TripPermissionService;
+import com.example.pventure.domain.user.entity.User;
+import com.example.pventure.domain.user.repository.UserRepository;
+import com.example.pventure.global.exception.ApiException;
+import com.example.pventure.global.exception.ErrorCode;
+import com.example.pventure.global.s3.S3KeyGenerator;
+import com.example.pventure.global.s3.S3Service;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+@Service
+@Transactional
+@RequiredArgsConstructor
+public class PhotoServiceImpl implements PhotoService {
+
+    private final S3Service s3Service;
+    private final TripPermissionService tripPermissionService;
+    private final S3KeyGenerator s3KeyGenerator;
+    private final UserRepository userRepository;
+    private final TripRepository tripRepository;
+    private final AlbumRepository albumRepository;
+    private final PhotoRepository photoRepository;
+
+    @Override
+    @Transactional(readOnly = true)
+    public List<UploadUrlResponseDto> generateUploadUrls(Long userId, Long tripId, List<UploadUrlRequestDto> requestDtos) {
+
+        Trip trip = tripPermissionService.getEditableTrip(userId, tripId);
+
+        return requestDtos.stream()
+            .map(requestDto -> {
+                String s3Key = s3KeyGenerator.generatePhotoKey(trip.getId(), requestDto.getOriginalFileName());
+                String uploadUrl = s3Service.createUploadUrl(s3Key);
+
+                return UploadUrlResponseDto.builder()
+                    .s3Key(s3Key)
+                    .uploadUrl(uploadUrl)
+                    .originalFileName(requestDto.getOriginalFileName())
+                    .build();
+            })
+            .toList();
+    }
+
+    @Override
+    public List<PhotoResponseDto> createPhotos(Long userId, Long tripId, Long albumId, List<PhotoRequestDto> requestDtos) {
+
+        User user = loadUser(userId);
+        Trip trip = loadTrip(tripId);
+
+        tripPermissionService.checkEditableTrip(user, trip);
+
+        Album album;
+
+        if (albumId != null) {
+            album = loadAlbum(albumId, trip);
+        } else {
+            album = null;
+        }
+
+        return requestDtos.stream()
+            .map(requestDto -> {
+
+                Photo photo = requestDto.toEntity(trip, album, user);
+                Photo savedPhoto = photoRepository.save(photo);
+
+                String downloadUrl = s3Service.createDownloadUrl(savedPhoto.getS3Key());
+
+                return PhotoResponseDto.from(savedPhoto, downloadUrl);
+            })
+            .toList();
+    }
+
+    @Override
+    @Transactional(readOnly = true)
+    public List<PhotoResponseDto> getPhotosByAlbum(Long userId, Long tripId, Long albumId) {
+
+        Trip trip = tripPermissionService.getViewableTrip(userId, tripId);
+
+        Album album = loadAlbum(albumId, trip);
+
+        List<Photo> photos = photoRepository.findAllByAlbum(album);
+
+        return photos.stream()
+            .map(photo -> {
+                String downloadUrl = s3Service.createDownloadUrl(photo.getS3Key());
+                return PhotoResponseDto.from(photo, downloadUrl);
+            })
+            .toList();
+    }
+
+    @Override
+    @Transactional(readOnly = true)
+    public List<PhotoResponseDto> getUnassignedPhotos(Long userId, Long tripId) {
+
+        Trip trip = tripPermissionService.getViewableTrip(userId, tripId);
+
+        List<Photo> photos = photoRepository.findAllByTripAndAlbumIsNull(trip);
+
+        return photos.stream()
+            .map(photo -> {
+                String downloadUrl = s3Service.createDownloadUrl(photo.getS3Key());
+                return PhotoResponseDto.from(photo, downloadUrl);
+            })
+            .toList();
+    }
+
+    @Override
+    @Transactional(readOnly = true)
+    public PhotoDetailResponseDto getPhoto(Long userId, Long tripId, Long photoId) {
+
+        Trip trip = tripPermissionService.getViewableTrip(userId, tripId);
+
+        Photo photo = photoRepository.findByIdAndTrip(photoId, trip)
+            .orElseThrow(() -> new ApiException(ErrorCode.NOT_FOUND_PHOTO));
+
+        String downloadUrl = s3Service.createDownloadUrl(photo.getS3Key());
+
+        return PhotoDetailResponseDto.from(photo, downloadUrl);
+    }
+
+    @Override
+    public void movePhotos(Long userId, Long tripId, Long targetAlbumId, List<Long> photoIds) {
+
+        if (photoIds == null || photoIds.isEmpty()) {
+            return;
+        }
+
+        Trip trip = tripPermissionService.getEditableTrip(userId, tripId);
+
+        Album album;
+
+        if (targetAlbumId != null) {
+            album = loadAlbum(targetAlbumId, trip);
+        } else {
+            album = null;
+        }
+
+        List<Photo> photos = loadPhotos(photoIds, trip);
+        photos.forEach(photo -> photo.updateAlbum(album));
+    }
+
+    @Override
+    public void deletePhotos(Long userId, Long tripId, List<Long> photoIds) {
+
+        if (photoIds == null || photoIds.isEmpty()) {
+            return;
+        }
+
+        Trip trip = tripPermissionService.getEditableTrip(userId, tripId);
+
+        List<Photo> photos = loadPhotos(photoIds, trip);
+        photos.forEach(photo -> s3Service.deleteFile(photo.getS3Key()));
+
+        photoRepository.deleteAll(photos);
+    }
+
+    @Override
+    public Long countPhotos(Album album) {
+        return photoRepository.countByAlbum(album);
+    }
+
+    private User loadUser(Long userId) {
+        return userRepository.findById(userId)
+            .orElseThrow(() -> new ApiException(ErrorCode.NOT_FOUND_USER));
+    }
+
+    private Trip loadTrip(Long tripId) {
+        return tripRepository.findById(tripId)
+            .orElseThrow(() -> new ApiException(ErrorCode.NOT_FOUND_TRIP));
+    }
+
+    private Album loadAlbum(Long albumId, Trip trip) {
+        return albumRepository.findByIdAndTrip(albumId, trip)
+            .orElseThrow(() -> new ApiException(ErrorCode.NOT_FOUND_ALBUM));
+    }
+
+    private List<Photo> loadPhotos(List<Long> photoIds, Trip trip) {
+        Set<Long> uniqueIds = new HashSet<>(photoIds);
+        List<Photo> photos = photoRepository.findAllByIdInAndTrip(uniqueIds, trip);
+
+        if (photos.size() != uniqueIds.size()) {
+            throw new ApiException(ErrorCode.NOT_FOUND_PHOTO);
+        }
+        return photos;
+    }
+}
diff --git a/src/main/java/com/example/pventure/domain/photo/service/README.md b/src/main/java/com/example/pventure/domain/photo/service/README.md
deleted file mode 100644
index 993bc16..0000000
--- a/src/main/java/com/example/pventure/domain/photo/service/README.md
+++ /dev/null
@@ -1 +0,0 @@
-# Photo 관련 비즈니스 로직
\ No newline at end of file
diff --git a/src/main/java/com/example/pventure/domain/schedule/docs/GetScheduleDocs.java b/src/main/java/com/example/pventure/domain/schedule/docs/GetScheduleDocs.java
index f44d9dd..5c3294a 100644
--- a/src/main/java/com/example/pventure/domain/schedule/docs/GetScheduleDocs.java
+++ b/src/main/java/com/example/pventure/domain/schedule/docs/GetScheduleDocs.java
@@ -2,6 +2,7 @@
 
 import io.swagger.v3.oas.annotations.Operation;
 
+import io.swagger.v3.oas.annotations.responses.ApiResponse;
 import java.lang.annotation.*;
 
 @Documented
@@ -11,4 +12,6 @@
         summary = ScheduleSwaggerDocs.GET_ONE_SUMMARY,
         description = ScheduleSwaggerDocs.GET_ONE_DESCRIPTION
 )
+@ApiResponse(responseCode = "200", description = "조회 성공", useReturnTypeSchema = true)
+@ApiResponse(responseCode = "404", description = "여행 또는 사용자 없음")
 public @interface GetScheduleDocs {}
diff --git a/src/main/java/com/example/pventure/domain/schedule/docs/GetSchedulesDocs.java b/src/main/java/com/example/pventure/domain/schedule/docs/GetSchedulesDocs.java
index a9f9f3c..833a1a8 100644
--- a/src/main/java/com/example/pventure/domain/schedule/docs/GetSchedulesDocs.java
+++ b/src/main/java/com/example/pventure/domain/schedule/docs/GetSchedulesDocs.java
@@ -2,6 +2,7 @@
 
 import io.swagger.v3.oas.annotations.Operation;
 
+import io.swagger.v3.oas.annotations.responses.ApiResponse;
 import java.lang.annotation.*;
 
 @Documented
@@ -11,4 +12,6 @@
         summary = ScheduleSwaggerDocs.GET_BY_DAY_SUMMARY,
         description = ScheduleSwaggerDocs.GET_BY_DAY_DESCRIPTION
 )
+@ApiResponse(responseCode = "200", description = "조회 성공", useReturnTypeSchema = true)
+@ApiResponse(responseCode = "404", description = "여행 또는 사용자 없음")
 public @interface GetSchedulesDocs {}
diff --git a/src/main/java/com/example/pventure/domain/schedule/docs/ReorderScheduleDocs.java b/src/main/java/com/example/pventure/domain/schedule/docs/ReorderScheduleDocs.java
index 0207552..cb9b3df 100644
--- a/src/main/java/com/example/pventure/domain/schedule/docs/ReorderScheduleDocs.java
+++ b/src/main/java/com/example/pventure/domain/schedule/docs/ReorderScheduleDocs.java
@@ -2,6 +2,7 @@
 
 import io.swagger.v3.oas.annotations.Operation;
 
+import io.swagger.v3.oas.annotations.responses.ApiResponse;
 import java.lang.annotation.*;
 
 @Documented
@@ -11,4 +12,6 @@
         summary = ScheduleSwaggerDocs.REORDER_SUMMARY,
         description = ScheduleSwaggerDocs.REORDER_DESCRIPTION
 )
+@ApiResponse(responseCode = "200", description = "수정 성공", useReturnTypeSchema = true)
+@ApiResponse(responseCode = "404", description = "여행 또는 사용자 또는 일정 없음")
 public @interface ReorderScheduleDocs {}
diff --git a/src/main/java/com/example/pventure/domain/schedule/docs/UpdateScheduleDocs.java b/src/main/java/com/example/pventure/domain/schedule/docs/UpdateScheduleDocs.java
index 78eab76..e4f5ac7 100644
--- a/src/main/java/com/example/pventure/domain/schedule/docs/UpdateScheduleDocs.java
+++ b/src/main/java/com/example/pventure/domain/schedule/docs/UpdateScheduleDocs.java
@@ -2,6 +2,7 @@
 
 import io.swagger.v3.oas.annotations.Operation;
 
+import io.swagger.v3.oas.annotations.responses.ApiResponse;
 import java.lang.annotation.*;
 
 @Documented
@@ -11,4 +12,6 @@
         summary = ScheduleSwaggerDocs.UPDATE_SUMMARY,
         description = ScheduleSwaggerDocs.UPDATE_DESCRIPTION
 )
+@ApiResponse(responseCode = "200", description = "수정 성공", useReturnTypeSchema = true)
+@ApiResponse(responseCode = "404", description = "여행 또는 사용자 또는 일정 없음")
 public @interface UpdateScheduleDocs {}
diff --git a/src/main/java/com/example/pventure/domain/trip/docs/CreateTripDocs.java b/src/main/java/com/example/pventure/domain/trip/docs/CreateTripDocs.java
index bd3913b..842785f 100644
--- a/src/main/java/com/example/pventure/domain/trip/docs/CreateTripDocs.java
+++ b/src/main/java/com/example/pventure/domain/trip/docs/CreateTripDocs.java
@@ -3,7 +3,6 @@
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.media.Content;
 import io.swagger.v3.oas.annotations.responses.ApiResponse;
-import io.swagger.v3.oas.annotations.responses.ApiResponses;
 
 import java.lang.annotation.*;
 
@@ -14,8 +13,6 @@
         summary = TripSwaggerDocs.CREATE_TRIP_SUMMARY,
         description = TripSwaggerDocs.CREATE_TRIP_DESCRIPTION
 )
-@ApiResponses({
-        @ApiResponse(responseCode = "201", description = "생성 성공", useReturnTypeSchema = true),
-        @ApiResponse(responseCode = "400", description = "잘못된 요청", content = @Content)
-})
+@ApiResponse(responseCode = "201", description = "생성 성공", useReturnTypeSchema = true)
+@ApiResponse(responseCode = "400", description = "잘못된 요청", content = @Content)
 public @interface CreateTripDocs {}
diff --git a/src/main/java/com/example/pventure/domain/trip/docs/DeleteTripDocs.java b/src/main/java/com/example/pventure/domain/trip/docs/DeleteTripDocs.java
index a4ba4b3..9215a08 100644
--- a/src/main/java/com/example/pventure/domain/trip/docs/DeleteTripDocs.java
+++ b/src/main/java/com/example/pventure/domain/trip/docs/DeleteTripDocs.java
@@ -2,7 +2,6 @@
 
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.responses.ApiResponse;
-import io.swagger.v3.oas.annotations.responses.ApiResponses;
 
 import java.lang.annotation.*;
 
@@ -13,8 +12,6 @@
         summary = TripSwaggerDocs.DELETE_TRIP_SUMMARY,
         description = TripSwaggerDocs.DELETE_TRIP_DESCRIPTION
 )
-@ApiResponses({
-        @ApiResponse(responseCode = "204", description = "삭제 성공"),
-        @ApiResponse(responseCode = "404", description = "여행 없음")
-})
+@ApiResponse(responseCode = "204", description = "삭제 성공")
+@ApiResponse(responseCode = "404", description = "여행 없음")
 public @interface DeleteTripDocs {}
diff --git a/src/main/java/com/example/pventure/domain/trip/docs/GetTripDocs.java b/src/main/java/com/example/pventure/domain/trip/docs/GetTripDocs.java
index 906d5e8..431c275 100644
--- a/src/main/java/com/example/pventure/domain/trip/docs/GetTripDocs.java
+++ b/src/main/java/com/example/pventure/domain/trip/docs/GetTripDocs.java
@@ -3,7 +3,6 @@
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.media.Content;
 import io.swagger.v3.oas.annotations.responses.ApiResponse;
-import io.swagger.v3.oas.annotations.responses.ApiResponses;
 
 import java.lang.annotation.*;
 
@@ -14,8 +13,6 @@
         summary = TripSwaggerDocs.GET_TRIP_SUMMARY,
         description = TripSwaggerDocs.GET_TRIP_DESCRIPTION
 )
-@ApiResponses({
-        @ApiResponse(responseCode = "200", description = "조회 성공", useReturnTypeSchema = true),
-        @ApiResponse(responseCode = "404", description = "여행 없음", content = @Content)
-})
+@ApiResponse(responseCode = "200", description = "조회 성공", useReturnTypeSchema = true)
+@ApiResponse(responseCode = "404", description = "여행 없음", content = @Content)
 public @interface GetTripDocs {}
diff --git a/src/main/java/com/example/pventure/domain/trip/docs/GetTripsDocs.java b/src/main/java/com/example/pventure/domain/trip/docs/GetTripsDocs.java
index bd60d2b..f3f1f31 100644
--- a/src/main/java/com/example/pventure/domain/trip/docs/GetTripsDocs.java
+++ b/src/main/java/com/example/pventure/domain/trip/docs/GetTripsDocs.java
@@ -3,7 +3,6 @@
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.media.Content;
 import io.swagger.v3.oas.annotations.responses.ApiResponse;
-import io.swagger.v3.oas.annotations.responses.ApiResponses;
 
 import java.lang.annotation.*;
 
@@ -14,8 +13,6 @@
         summary = TripSwaggerDocs.GET_TRIPS_SUMMARY,
         description = TripSwaggerDocs.GET_TRIPS_DESCRIPTION
 )
-@ApiResponses({
-        @ApiResponse(responseCode = "200", description = "조회 성공", useReturnTypeSchema = true),
-        @ApiResponse(responseCode = "400", description = "잘못된 요청", content = @Content)
-})
+@ApiResponse(responseCode = "200", description = "조회 성공", useReturnTypeSchema = true)
+@ApiResponse(responseCode = "400", description = "잘못된 요청", content = @Content)
 public @interface GetTripsDocs {}
diff --git a/src/main/java/com/example/pventure/domain/trip/docs/UpdateTripDocs.java b/src/main/java/com/example/pventure/domain/trip/docs/UpdateTripDocs.java
index 3bbcc1c..b7fd988 100644
--- a/src/main/java/com/example/pventure/domain/trip/docs/UpdateTripDocs.java
+++ b/src/main/java/com/example/pventure/domain/trip/docs/UpdateTripDocs.java
@@ -3,7 +3,6 @@
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.media.Content;
 import io.swagger.v3.oas.annotations.responses.ApiResponse;
-import io.swagger.v3.oas.annotations.responses.ApiResponses;
 
 import java.lang.annotation.*;
 
@@ -14,9 +13,7 @@
         summary = TripSwaggerDocs.UPDATE_TRIP_SUMMARY,
         description = TripSwaggerDocs.UPDATE_TRIP_DESCRIPTION
 )
-@ApiResponses({
-        @ApiResponse(responseCode = "200", description = "수정 성공", useReturnTypeSchema = true),
-        @ApiResponse(responseCode = "400", description = "잘못된 요청", content = @Content),
-        @ApiResponse(responseCode = "404", description = "여행 없음", content = @Content)
-})
+@ApiResponse(responseCode = "200", description = "수정 성공", useReturnTypeSchema = true)
+@ApiResponse(responseCode = "400", description = "잘못된 요청", content = @Content)
+@ApiResponse(responseCode = "404", description = "여행 없음", content = @Content)
 public @interface UpdateTripDocs {}
diff --git a/src/main/java/com/example/pventure/domain/tripFolder/docs/AddTripToFolderDocs.java b/src/main/java/com/example/pventure/domain/tripFolder/docs/AddTripToFolderDocs.java
index afff4fe..1fea5cd 100644
--- a/src/main/java/com/example/pventure/domain/tripFolder/docs/AddTripToFolderDocs.java
+++ b/src/main/java/com/example/pventure/domain/tripFolder/docs/AddTripToFolderDocs.java
@@ -2,7 +2,6 @@
 
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.responses.ApiResponse;
-import io.swagger.v3.oas.annotations.responses.ApiResponses;
 
 import java.lang.annotation.*;
 
@@ -13,8 +12,6 @@
         summary = TripFolderSwaggerDocs.ADD_TRIP_SUMMARY,
         description = TripFolderSwaggerDocs.ADD_TRIP_DESCRIPTION
 )
-@ApiResponses({
-        @ApiResponse(responseCode = "200", description = "추가 성공", useReturnTypeSchema = true),
-        @ApiResponse(responseCode = "404", description = "폴더, 여행 또는 사용자 없음")
-})
+@ApiResponse(responseCode = "200", description = "추가 성공", useReturnTypeSchema = true)
+@ApiResponse(responseCode = "404", description = "폴더, 여행 또는 사용자 없음")
 public @interface AddTripToFolderDocs {}
diff --git a/src/main/java/com/example/pventure/domain/tripFolder/docs/DeleteTripInFolderDocs.java b/src/main/java/com/example/pventure/domain/tripFolder/docs/DeleteTripInFolderDocs.java
index 417397e..e8da5f4 100644
--- a/src/main/java/com/example/pventure/domain/tripFolder/docs/DeleteTripInFolderDocs.java
+++ b/src/main/java/com/example/pventure/domain/tripFolder/docs/DeleteTripInFolderDocs.java
@@ -2,7 +2,6 @@
 
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.responses.ApiResponse;
-import io.swagger.v3.oas.annotations.responses.ApiResponses;
 
 import java.lang.annotation.*;
 
@@ -13,8 +12,6 @@
         summary = TripFolderSwaggerDocs.DELETE_TRIP_SUMMARY,
         description = TripFolderSwaggerDocs.DELETE_TRIP_DESCRIPTION
 )
-@ApiResponses({
-        @ApiResponse(responseCode = "204", description = "삭제 성공"),
-        @ApiResponse(responseCode = "404", description = "폴더, 여행 또는 사용자 없음")
-})
+@ApiResponse(responseCode = "204", description = "삭제 성공")
+@ApiResponse(responseCode = "404", description = "폴더, 여행 또는 사용자 없음")
 public @interface DeleteTripInFolderDocs {}
diff --git a/src/main/java/com/example/pventure/domain/tripFolder/docs/GetTripsInFolderDocs.java b/src/main/java/com/example/pventure/domain/tripFolder/docs/GetTripsInFolderDocs.java
index 0e5272c..9987de0 100644
--- a/src/main/java/com/example/pventure/domain/tripFolder/docs/GetTripsInFolderDocs.java
+++ b/src/main/java/com/example/pventure/domain/tripFolder/docs/GetTripsInFolderDocs.java
@@ -2,7 +2,6 @@
 
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.responses.ApiResponse;
-import io.swagger.v3.oas.annotations.responses.ApiResponses;
 
 import java.lang.annotation.*;
 
@@ -13,8 +12,6 @@
         summary = TripFolderSwaggerDocs.GET_TRIPS_SUMMARY,
         description = TripFolderSwaggerDocs.GET_TRIPS_DESCRIPTION
 )
-@ApiResponses({
-        @ApiResponse(responseCode = "200", description = "조회 성공", useReturnTypeSchema = true),
-        @ApiResponse(responseCode = "404", description = "폴더 또는 사용자 없음")
-})
+@ApiResponse(responseCode = "200", description = "조회 성공", useReturnTypeSchema = true)
+@ApiResponse(responseCode = "404", description = "폴더 또는 사용자 없음")
 public @interface GetTripsInFolderDocs {}
diff --git a/src/main/java/com/example/pventure/global/config/S3Config.java b/src/main/java/com/example/pventure/global/config/S3Config.java
new file mode 100644
index 0000000..b1c4105
--- /dev/null
+++ b/src/main/java/com/example/pventure/global/config/S3Config.java
@@ -0,0 +1,40 @@
+package com.example.pventure.global.config;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import software.amazon.awssdk.auth.credentials.AwsCredentialsProvider;
+import software.amazon.awssdk.auth.credentials.DefaultCredentialsProvider;
+import software.amazon.awssdk.regions.Region;
+import software.amazon.awssdk.services.s3.S3Client;
+import software.amazon.awssdk.services.s3.presigner.S3Presigner;
+
+@Configuration
+public class S3Config {
+
+    @Value("${aws.s3.region}")
+    private String region;
+
+    @Bean
+    AwsCredentialsProvider awsCredentialsProvider() {
+        return DefaultCredentialsProvider.create();
+    }
+
+    @Bean
+    public S3Client s3Client(AwsCredentialsProvider provider) {
+
+        return S3Client.builder()
+            .region(Region.of(region))
+            .credentialsProvider(provider)
+            .build();
+    }
+
+    @Bean
+    public S3Presigner s3Presigner(AwsCredentialsProvider provider) {
+
+        return S3Presigner.builder()
+            .region(Region.of(region))
+            .credentialsProvider(provider)
+            .build();
+    }
+}
diff --git a/src/main/java/com/example/pventure/global/s3/S3KeyGenerator.java b/src/main/java/com/example/pventure/global/s3/S3KeyGenerator.java
new file mode 100644
index 0000000..a1a0e2b
--- /dev/null
+++ b/src/main/java/com/example/pventure/global/s3/S3KeyGenerator.java
@@ -0,0 +1,48 @@
+package com.example.pventure.global.s3;
+
+import java.util.Set;
+import java.util.UUID;
+import org.springframework.stereotype.Component;
+
+@Component
+public class S3KeyGenerator {
+
+    private static final Set<String> ALLOWED_EXTENSIONS = Set.of("jpg", "jpeg", "png", "webp");
+
+    public String generatePhotoKey(Long tripId, String originalFilename) {
+        String ext = extractAndValidateExtension(originalFilename);
+        String uuid = UUID.randomUUID().toString();
+        return String.format("trips/%d/photos/%s.%s", tripId, uuid, ext);
+    }
+
+    public String generateTripThumbnailKey(Long tripId, String originalFilename) {
+        String ext = extractAndValidateExtension(originalFilename);
+        String uuid = UUID.randomUUID().toString();
+        return String.format("trips/%d/thumbnail/%s.%s", tripId, uuid, ext);
+    }
+
+    public String generateProfileImgKey(Long userId, String originalFilename) {
+        String ext = extractAndValidateExtension(originalFilename);
+        String uuid = UUID.randomUUID().toString();
+        return String.format("users/%d/profiles/%s.%s", userId, uuid, ext);
+    }
+
+    private String extractAndValidateExtension(String originalFilename) {
+        if (originalFilename == null || originalFilename.isBlank()) {
+            throw new IllegalArgumentException("파일명은 비어 있을 수 없습니다.");
+        }
+
+        int index = originalFilename.lastIndexOf(".");
+        if (index == -1 || index == originalFilename.length() - 1) {
+            throw new IllegalArgumentException("파일 확장자가 존재하지 않습니다.");
+        }
+
+        String ext = originalFilename.substring(index + 1).toLowerCase();
+
+        if (!ALLOWED_EXTENSIONS.contains(ext)) {
+            throw new IllegalArgumentException("허용되지 않은 파일 확장자입니다: " + ext);
+        }
+
+        return ext;
+    }
+}
diff --git a/src/main/java/com/example/pventure/global/s3/S3Service.java b/src/main/java/com/example/pventure/global/s3/S3Service.java
new file mode 100644
index 0000000..570276c
--- /dev/null
+++ b/src/main/java/com/example/pventure/global/s3/S3Service.java
@@ -0,0 +1,65 @@
+package com.example.pventure.global.s3;
+
+import java.time.Duration;
+import lombok.RequiredArgsConstructor;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Service;
+import software.amazon.awssdk.services.s3.S3Client;
+import software.amazon.awssdk.services.s3.model.DeleteObjectRequest;
+import software.amazon.awssdk.services.s3.model.GetObjectRequest;
+import software.amazon.awssdk.services.s3.model.PutObjectRequest;
+import software.amazon.awssdk.services.s3.presigner.S3Presigner;
+import software.amazon.awssdk.services.s3.presigner.model.GetObjectPresignRequest;
+import software.amazon.awssdk.services.s3.presigner.model.PutObjectPresignRequest;
+
+@Service
+@RequiredArgsConstructor
+public class S3Service {
+
+    @Value("${aws.s3.bucket}")
+    private String bucket;
+
+    @Value("${aws.s3.duration}")
+    private Duration duration;
+
+    private final S3Client s3Client;
+    private final S3Presigner s3Presigner;
+
+    public String createUploadUrl(String key) {
+
+        PutObjectRequest objectRequest = PutObjectRequest.builder()
+            .bucket(bucket)
+            .key(key)
+            .build();
+
+        PutObjectPresignRequest presignRequest = PutObjectPresignRequest.builder()
+            .signatureDuration(duration)
+            .putObjectRequest(objectRequest)
+            .build();
+
+        return s3Presigner.presignPutObject(presignRequest).url().toString();
+    }
+
+    public String createDownloadUrl(String key) {
+
+        GetObjectRequest objectRequest = GetObjectRequest.builder()
+            .bucket(bucket)
+            .key(key)
+            .build();
+
+        GetObjectPresignRequest presignRequest = GetObjectPresignRequest.builder()
+            .signatureDuration(duration)
+            .getObjectRequest(objectRequest)
+            .build();
+
+        return s3Presigner.presignGetObject(presignRequest).url().toString();
+    }
+
+    public void deleteFile(String key) {
+
+        s3Client.deleteObject(DeleteObjectRequest.builder()
+            .bucket(bucket)
+            .key(key)
+            .build());
+    }
+}
diff --git a/src/main/resources/application-dev.yml b/src/main/resources/application-dev.yml
index f387b8f..f94f3a7 100644
--- a/src/main/resources/application-dev.yml
+++ b/src/main/resources/application-dev.yml
@@ -24,4 +24,10 @@ logging:
   level:
     root: info
     org.hibernate.SQL: debug
-    org.hibernate.type.descriptor.sql.BasicBinder: trace
\ No newline at end of file
+    org.hibernate.type.descriptor.sql.BasicBinder: trace
+
+aws:
+  s3:
+    bucket: ${S3_BUCKET}
+    region: ${S3_REGION}
+    duration: PT10M
\ No newline at end of file
diff --git a/src/main/resources/db/migration/dev/V1__insert_seed_data.sql b/src/main/resources/db/migration/dev/V1__insert_seed_data.sql
index 37eaa92..98674a7 100644
--- a/src/main/resources/db/migration/dev/V1__insert_seed_data.sql
+++ b/src/main/resources/db/migration/dev/V1__insert_seed_data.sql
@@ -1,14 +1,14 @@
 -- 1. Users
 -- =====================================================
 INSERT INTO users (id, name, email, social_provider, provider_id, image_url, created_at, updated_at)
-VALUES (1, '테스트 사용자1', 'test1@example.com', 'GOOGLE', 'google_001', 'https://example.com/image1.png', NOW(), NOW()),
-       (2, '테스트 사용자2', 'test2@example.com', 'NAVER', 'naver_001', 'https://example.com/image2.png', NOW(), NOW()),
+VALUES (1, '테스트 사용자1', 'test1@example.com', 'GOOGLE', 'google_001', 'https://example.com/image1.jpg', NOW(), NOW()),
+       (2, '테스트 사용자2', 'test2@example.com', 'NAVER', 'naver_001', 'https://example.com/image2.jpg', NOW(), NOW()),
        (3, '테스트 사용자3', 'test3@example.com', 'KAKAO', 'kakao_001', NULL, NOW(), NOW()),
        (4, '테스트 사용자4', 'test4@example.com', 'KAKAO', 'kakao_002', NULL, NOW(), NOW()),
        (5, '테스트 사용자5', 'test5@example.com', 'KAKAO', 'kakao_003', NULL, NOW(), NOW()),
        (6, '테스트 사용자6', 'test6@example.com', 'KAKAO', 'kakao_004', NULL, NOW(), NOW()),
-       (7, '테스트 사용자7', 'test7@example.com', 'GOOGLE', 'google_007', 'https://example.com/image7.png', NOW(), NOW()),
-       (8, '테스트 사용자8', 'test8@example.com', 'NAVER', 'naver_008', 'https://example.com/image8.png', NOW(), NOW()),
+       (7, '테스트 사용자7', 'test7@example.com', 'GOOGLE', 'google_007', 'https://example.com/image7.jpg', NOW(), NOW()),
+       (8, '테스트 사용자8', 'test8@example.com', 'NAVER', 'naver_008', 'https://example.com/image8.jpg', NOW(), NOW()),
        (9, '테스트 사용자9', 'test9@example.com', 'KAKAO', 'kakao_009', NULL, NOW(), NOW()),
        (10, '테스트 사용자10', 'test10@example.com', 'KAKAO', 'kakao_010', NULL, NOW(), NOW());
 
@@ -108,24 +108,24 @@ VALUES
 -- =====================================================
 -- 8. Photo
 -- =====================================================
-INSERT INTO photo (id, album_id, url, caption, created_at, updated_at)
+INSERT INTO photo (id, trip_id, album_id, uploader_id, original_file_name, content_type, file_size, s3key, created_at, updated_at)
 VALUES
     -- 서울
-    (1, 1, 'https://example.com/photo1.png', '경복궁 입구', NOW(), NOW()),
-    (2, 1, 'https://example.com/photo2.png', '남산타워 전망', NOW(), NOW()),
+    (1, 1, 1, 2, 'IMG_01.JPG', 'image/jpeg', 2301234,'trips/1/photos/photo1.jpg', NOW(), NOW()),
+    (2, 1, 1, 2, 'IMG_02.JPG', 'image/jpeg', 2301234,'trips/1/photos/photo2.jpg', NOW(), NOW()),
     -- 부산
-    (3, 2, 'https://example.com/photo3.png', '해운대 해변', NOW(), NOW()),
-    (4, 2, 'https://example.com/photo4.png', '광안리 야경', NOW(), NOW()),
+    (3, 2, 2, 1, 'IMG_03.JPG', 'image/jpeg', 2301234,'trips/2/photos/photo3.jpg', NOW(), NOW()),
+    (4, 2, 2, 1, 'IMG_04.JPG', 'image/jpeg', 2301234,'trips/2/photos/photo4.jpg', NOW(), NOW()),
     -- 제주
-    (5, 3, 'https://example.com/photo5.png', '한라산 정상', NOW(), NOW()),
-    (6, 3, 'https://example.com/photo6.png', '성산일출봉', NOW(), NOW()),
-    (7, 3, 'https://example.com/photo7.png', '협재 해수욕장', NOW(), NOW()),
+    (5, 3, 3, 7, 'IMG_05.JPG', 'image/jpeg', 2301234,'trips/3/photos/photo5.jpg', NOW(), NOW()),
+    (6, 3, 3, 7, 'IMG_06.JPG', 'image/jpeg', 2301234,'trips/3/photos/photo6.jpg', NOW(), NOW()),
+    (7, 3, 3, 7, 'IMG_07.JPG', 'image/jpeg', 2301234,'trips/3/photos/photo7.jpg', NOW(), NOW()),
     -- 강릉
-    (8, 4, 'https://example.com/photo8.png', '정동진 일출', NOW(), NOW()),
-    (9, 4, 'https://example.com/photo9.png', '경포대 산책', NOW(), NOW()),
+    (8, 4, 4, 10, 'IMG_08.JPG', 'image/jpeg', 2301234,'trips/4/photos/photo8.jpg', NOW(), NOW()),
+    (9, 4, 4, 10, 'IMG_09.JPG', 'image/jpeg', 2301234,'trips/4/photos/photo9.jpg', NOW(), NOW()),
     -- 여수
-    (10, 5, 'https://example.com/photo10.png', '오동도 풍경', NOW(), NOW()),
-    (11, 5, 'https://example.com/photo11.png', '돌산대교 야경', NOW(), NOW());
+    (10, 5, 5, 2, 'IMG_10.JPG', 'image/jpeg', 2301234,'trips/5/photos/photo10.jpg', NOW(), NOW()),
+    (11, 5, 5, 2, 'IMG_11.JPG', 'image/jpeg', 2301234,'trips/5/photos/photo11.jpg', NOW(), NOW());
 
 -- =====================================================
 -- 9. Member
diff --git a/src/test/http/photo.http b/src/test/http/photo.http
new file mode 100644
index 0000000..e95128a
--- /dev/null
+++ b/src/test/http/photo.http
@@ -0,0 +1,44 @@
+### 업로드 URL 생성 (Generate Upload Urls)
+POST http://localhost:8080/api/trips/1/photos/upload-urls?userId=1
+Content-Type: application/json
+
+[
+  {
+    "originalFileName": "sampleImage1.jpeg",
+    "contentType": "image/jpeg",
+    "fileSize": 175042
+  }
+]
+
+### 사진 생성 (Create Photos)
+POST http://localhost:8080/api/trips/1/photos?userId=1
+Content-Type: application/json
+
+[
+  {
+    "s3Key" : "trips/1/photos/b1f7fdb1-9b2a-403b-9f4a-37cad070e306.jpeg",
+    "originalFileName" : "sampleImage1.jpeg",
+    "contentType" : "image/jpeg",
+    "fileSize" : 175042
+  }
+]
+
+### 앨범별 사진 조회 (Get Photos By Album)
+GET http://localhost:8080/api/trips/1/albums/1/photos?userId=1
+
+### 앨범 미지정 사진 조회 (Get Unassigned Photos)
+GET http://localhost:8080/api/trips/1/photos/unassigned?userId=1
+
+### 사진 상세 조회 (Get Photo)
+GET http://localhost:8080/api/trips/1/photos/1?userId=1
+
+### 특정 앨범으로 사진 이동 (Move Photos)
+PATCH http://localhost:8080/api/trips/1/albums/1/photos/move?userId=1
+Content-Type: application/json
+
+{
+  "photoIds" : [13]
+}
+
+### 사진 삭제 (Delete Photos)
+DELETE http://localhost:8080/api/trips/1/photos?userId=1&photoIds=12
diff --git a/src/test/java/com/example/pventure/domain/photo/service/PhotoServiceTest.java b/src/test/java/com/example/pventure/domain/photo/service/PhotoServiceTest.java
new file mode 100644
index 0000000..d140d25
--- /dev/null
+++ b/src/test/java/com/example/pventure/domain/photo/service/PhotoServiceTest.java
@@ -0,0 +1,493 @@
+package com.example.pventure.domain.photo.service;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyLong;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import com.example.pventure.domain.album.entity.Album;
+import com.example.pventure.domain.album.repository.AlbumRepository;
+import com.example.pventure.domain.photo.dto.request.PhotoRequestDto;
+import com.example.pventure.domain.photo.dto.response.PhotoDetailResponseDto;
+import com.example.pventure.domain.photo.dto.response.PhotoResponseDto;
+import com.example.pventure.domain.photo.entity.Photo;
+import com.example.pventure.domain.photo.repository.PhotoRepository;
+import com.example.pventure.domain.trip.entity.Trip;
+import com.example.pventure.domain.trip.enums.TripStatus;
+import com.example.pventure.domain.trip.repository.TripRepository;
+import com.example.pventure.domain.trip.service.TripPermissionService;
+import com.example.pventure.domain.user.entity.User;
+import com.example.pventure.domain.user.enums.SocialProvider;
+import com.example.pventure.domain.user.repository.UserRepository;
+import com.example.pventure.global.exception.ApiException;
+import com.example.pventure.global.exception.ErrorCode;
+import com.example.pventure.global.s3.S3Service;
+import java.lang.reflect.Field;
+import java.time.LocalDate;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Optional;
+import java.util.Set;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+@ExtendWith(MockitoExtension.class)
+class PhotoServiceTest {
+
+    @InjectMocks
+    private PhotoServiceImpl photoService;
+
+    @Mock private S3Service s3Service;
+    @Mock private TripPermissionService tripPermissionService;
+    @Mock private UserRepository userRepository;
+    @Mock private TripRepository tripRepository;
+    @Mock private AlbumRepository albumRepository;
+    @Mock private PhotoRepository photoRepository;
+
+    private User user;
+    private Trip trip;
+    private Album album;
+    private Photo photo;
+
+    @BeforeEach
+    void setUp() throws Exception {
+        user = User.builder()
+            .name("홍길동")
+            .email("hong@example.com")
+            .socialProvider(SocialProvider.GOOGLE)
+            .providerId("google-id-123")
+            .imageUrl("https://example.com/image.jpg")
+            .build();
+        setId(user, 1L);
+
+        trip = Trip.builder()
+            .title("제주 여행")
+            .status(TripStatus.COMPLETED)
+            .startDate(LocalDate.now())
+            .endDate(LocalDate.now().plusDays(3))
+            .build();
+        setId(trip, 10L);
+
+        album = Album.builder()
+            .title("1일차 앨범")
+            .trip(trip)
+            .build();
+        setId(album, 100L);
+
+        photo = Photo.builder()
+            .trip(trip)
+            .album(album)
+            .uploader(user)
+            .originalFileName("IMG_01.JPG")
+            .contentType("image/jpeg")
+            .fileSize(345678L)
+            .s3Key("trips/10/photos/uuid_IMG_01.JPG")
+            .build();
+        setId(photo, 1000L);
+    }
+
+    private void setId(Object entity, Long id) throws Exception {
+        Field idField = entity.getClass().getSuperclass().getDeclaredField("id");
+        idField.setAccessible(true);
+        idField.set(entity, id);
+    }
+
+    @Test
+    @DisplayName("createPhotos 성공: albumId가 있는 경우")
+    void createPhotos_success_withAlbum() {
+        // given
+        Long userId = 1L;
+        Long tripId = 10L;
+        Long albumId = 100L;
+
+        PhotoRequestDto requestDto = mock(PhotoRequestDto.class);
+        Photo photo = mock(Photo.class);
+        Photo savedPhoto = mock(Photo.class);
+
+        when(userRepository.findById(userId)).thenReturn(Optional.of(user));
+        when(tripRepository.findById(tripId)).thenReturn(Optional.of(trip));
+        when(albumRepository.findByIdAndTrip(albumId, trip)).thenReturn(Optional.of(album));
+
+        when(requestDto.toEntity(trip, album, user)).thenReturn(photo);
+        when(photoRepository.save(photo)).thenReturn(savedPhoto);
+
+        when(savedPhoto.getId()).thenReturn(1000L);
+        when(savedPhoto.getS3Key()).thenReturn("s3/key/1000");
+        when(s3Service.createDownloadUrl("s3/key/1000")).thenReturn("download-url-1000");
+
+        // when
+        List<PhotoResponseDto> response = photoService.createPhotos(userId, tripId, albumId, List.of(requestDto));
+
+        // then
+        assertEquals(1, response.size());
+        assertEquals(1000L, response.get(0).getId());
+        assertEquals("download-url-1000", response.get(0).getDownloadUrl());
+
+        verify(tripPermissionService, times(1)).checkEditableTrip(user, trip);
+        verify(albumRepository, times(1)).findByIdAndTrip(albumId, trip);
+        verify(photoRepository, times(1)).save(photo);
+        verify(s3Service, times(1)).createDownloadUrl("s3/key/1000");
+    }
+
+    @Test
+    @DisplayName("createPhotos 성공: albumId가 null인 경우")
+    void createPhotos_success_withoutAlbum() {
+        // given
+        Long userId = 1L;
+        Long tripId = 10L;
+
+        PhotoRequestDto requestDto = mock(PhotoRequestDto.class);
+        Photo photo = mock(Photo.class);
+        Photo savedPhoto = mock(Photo.class);
+
+        when(userRepository.findById(userId)).thenReturn(Optional.of(user));
+        when(tripRepository.findById(tripId)).thenReturn(Optional.of(trip));
+
+        when(requestDto.toEntity(trip, null, user)).thenReturn(photo);
+        when(photoRepository.save(photo)).thenReturn(savedPhoto);
+
+        when(savedPhoto.getId()).thenReturn(1000L);
+        when(savedPhoto.getS3Key()).thenReturn("s3/key/1000");
+        when(s3Service.createDownloadUrl("s3/key/1000")).thenReturn("download-url-1000");
+
+        // when
+        List<PhotoResponseDto> response = photoService.createPhotos(userId, tripId, null, List.of(requestDto));
+
+        // then
+        assertEquals(1, response.size());
+        assertEquals(1000L, response.get(0).getId());
+        assertEquals("download-url-1000", response.get(0).getDownloadUrl());
+
+        verify(tripPermissionService, times(1)).checkEditableTrip(user, trip);
+        verify(albumRepository, never()).findByIdAndTrip(anyLong(), any(Trip.class));
+        verify(photoRepository, times(1)).save(photo);
+        verify(s3Service, times(1)).createDownloadUrl("s3/key/1000");
+    }
+
+    @Test
+    @DisplayName("createPhotos 실패: 없는 앨범")
+    void createPhoto_fail_albumNotFound() {
+        // given
+        Long userId = 1L;
+        Long tripId = 10L;
+        Long albumId = 999L;
+
+        when(userRepository.findById(userId)).thenReturn(Optional.of(user));
+        when(tripRepository.findById(tripId)).thenReturn(Optional.of(trip));
+        when(albumRepository.findByIdAndTrip(albumId, trip)).thenReturn(Optional.empty());
+
+        // when & then
+        ApiException ex = assertThrows(ApiException.class,
+            () -> photoService.createPhotos(userId, tripId, albumId, List.of()));
+
+        assertEquals(ErrorCode.NOT_FOUND_ALBUM, ex.getErrorCode());
+
+        verify(tripPermissionService, times(1)).checkEditableTrip(user, trip);
+        verify(photoRepository, never()).save(any());
+        verify(s3Service, never()).createDownloadUrl(anyString());
+    }
+
+    @Test
+    @DisplayName("getPhotosByAlbum 성공")
+    void getPhotosByAlbum_success() {
+        // given
+        Long userId = 1L;
+        Long tripId = 10L;
+        Long albumId = 100L;
+
+        Photo p1 = mock(Photo.class);
+        Photo p2 = mock(Photo.class);
+
+        when(tripPermissionService.getViewableTrip(userId, tripId)).thenReturn(trip);
+        when(albumRepository.findByIdAndTrip(albumId, trip)).thenReturn(Optional.of(album));
+        when(photoRepository.findAllByAlbum(album)).thenReturn(List.of(p1, p2));
+
+        when(p1.getId()).thenReturn(1000L);
+        when(p2.getId()).thenReturn(1001L);
+
+        when(p1.getS3Key()).thenReturn("s3/key/1");
+        when(p2.getS3Key()).thenReturn("s3/key/2");
+
+        when(s3Service.createDownloadUrl(p1.getS3Key())).thenReturn("download-url-1");
+        when(s3Service.createDownloadUrl(p2.getS3Key())).thenReturn("download-url-2");
+
+        // when
+        List<PhotoResponseDto> response = photoService.getPhotosByAlbum(userId, tripId, albumId);
+
+        // then
+        assertEquals(2, response.size());
+        assertEquals(1000L, response.get(0).getId());
+
+        verify(tripPermissionService, times(1)).getViewableTrip(userId, tripId);
+        verify(albumRepository, times(1)).findByIdAndTrip(albumId, trip);
+        verify(photoRepository, times(1)).findAllByAlbum(album);
+        verify(s3Service, times(1)).createDownloadUrl("s3/key/1");
+        verify(s3Service, times(1)).createDownloadUrl("s3/key/2");
+    }
+
+    @Test
+    @DisplayName("getPhotosByAlbum 실패: 조회 권한 없음")
+    void getPhotosByAlbum_fail_permission() {
+        // given
+        Long userId = 1L;
+        Long tripId = 10L;
+        Long albumId = 100L;
+
+        ApiException permissionEx = new ApiException(ErrorCode.UNAUTHORIZED_MEMBER_ACCESS);
+        when(tripPermissionService.getViewableTrip(userId, tripId)).thenThrow(permissionEx);
+
+        // when & then
+        ApiException ex = assertThrows(ApiException.class,
+            () -> photoService.getPhotosByAlbum(userId, tripId, albumId));
+
+        assertEquals(ErrorCode.UNAUTHORIZED_MEMBER_ACCESS, ex.getErrorCode());
+
+        verify(tripPermissionService, times(1)).getViewableTrip(userId, tripId);
+        verify(albumRepository, never()).findByIdAndTrip(anyLong(), any(Trip.class));
+        verify(photoRepository, never()).findAllByAlbum(any(Album.class));
+        verify(s3Service, never()).createDownloadUrl(anyString());
+    }
+
+    @Test
+    @DisplayName("getPhotosByAlbum 실패: 없는 앨범")
+    void getPhotosByAlbum_fail_albumNotFound() {
+        // given
+        Long userId = 1L;
+        Long tripId = 10L;
+        Long albumId = 999L;
+
+        when(tripPermissionService.getViewableTrip(userId, tripId)).thenReturn(trip);
+        when(albumRepository.findByIdAndTrip(albumId, trip)).thenReturn(Optional.empty());
+
+        // when & then
+        ApiException ex = assertThrows(ApiException.class,
+            () -> photoService.getPhotosByAlbum(userId, tripId, albumId));
+
+        assertEquals(ErrorCode.NOT_FOUND_ALBUM, ex.getErrorCode());
+
+        verify(tripPermissionService, times(1)).getViewableTrip(userId, tripId);
+        verify(albumRepository, times(1)).findByIdAndTrip(albumId, trip);
+        verify(photoRepository, never()).findAllByAlbum(any(Album.class));
+        verify(s3Service, never()).createDownloadUrl(anyString());
+    }
+
+    @Test
+    @DisplayName("getUnassignedPhotos 성공")
+    void getUnassignedPhotos_success() {
+        // given
+        Long userId = 1L;
+        Long tripId = 10L;
+
+        photo.removeAlbum();
+
+        when(tripPermissionService.getViewableTrip(userId, tripId)).thenReturn(trip);
+        when(photoRepository.findAllByTripAndAlbumIsNull(trip)).thenReturn(List.of(photo));
+        when(s3Service.createDownloadUrl(photo.getS3Key())).thenReturn("download-url-1");
+
+        // when
+        List<PhotoResponseDto> response = photoService.getUnassignedPhotos(userId, tripId);
+
+        // then
+        assertEquals(1, response.size());
+        assertEquals(1000L, response.get(0).getId());
+
+        verify(tripPermissionService, times(1)).getViewableTrip(userId, tripId);
+        verify(photoRepository, times(1)).findAllByTripAndAlbumIsNull(trip);
+    }
+
+    @Test
+    @DisplayName("getUnassignedPhotos 실패: 조회 권한 없음")
+    void getUnassignedPhotos_fail_permission() {
+        // given
+        Long userId = 1L;
+        Long tripId = 10L;
+
+        ApiException permissionEx = new ApiException(ErrorCode.UNAUTHORIZED_MEMBER_ACCESS);
+        when(tripPermissionService.getViewableTrip(userId, tripId)).thenThrow(permissionEx);
+
+        // when & then
+        ApiException ex = assertThrows(ApiException.class,
+            () -> photoService.getUnassignedPhotos(userId, tripId));
+
+        assertEquals(ErrorCode.UNAUTHORIZED_MEMBER_ACCESS, ex.getErrorCode());
+
+        verify(tripPermissionService, times(1)).getViewableTrip(userId, tripId);
+        verify(photoRepository, never()).findAllByTripAndAlbumIsNull(any(Trip.class));
+        verify(s3Service, never()).createDownloadUrl(anyString());
+    }
+
+    @Test
+    @DisplayName("getPhoto 성공")
+    void getPhoto_success() {
+        // given
+        Long userId = 1L;
+        Long tripId = 10L;
+        Long photoId = 1000L;
+
+        when(tripPermissionService.getViewableTrip(userId, tripId)).thenReturn(trip);
+        when(photoRepository.findByIdAndTrip(photoId, trip)).thenReturn(Optional.of(photo));
+        when(s3Service.createDownloadUrl(photo.getS3Key())).thenReturn("download-url-1");
+
+        // when
+        PhotoDetailResponseDto response = photoService.getPhoto(userId, tripId, photoId);
+
+        // then
+        assertEquals(1000L, response.getId());
+        assertEquals("download-url-1", response.getDownloadUrl());
+        assertEquals("홍길동", response.getUploaderName());
+
+        verify(tripPermissionService, times(1)).getViewableTrip(userId, tripId);
+        verify(photoRepository, times(1)).findByIdAndTrip(photoId, trip);
+        verify(s3Service, times(1)).createDownloadUrl(photo.getS3Key());
+    }
+
+    @Test
+    @DisplayName("getPhoto 실패: 없는 사진")
+    void getPhoto_fail_photoNotFound() {
+        // given
+        Long userId = 1L;
+        Long tripId = 10L;
+        Long photoId = 9999L;
+
+        when(tripPermissionService.getViewableTrip(userId, tripId)).thenReturn(trip);
+        when(photoRepository.findByIdAndTrip(photoId, trip)).thenReturn(Optional.empty());
+
+        // when & then
+        ApiException ex = assertThrows(ApiException.class,
+            () -> photoService.getPhoto(userId, tripId, photoId));
+
+        assertEquals(ErrorCode.NOT_FOUND_PHOTO, ex.getErrorCode());
+
+        verify(tripPermissionService, times(1)).getViewableTrip(userId, tripId);
+        verify(photoRepository, times(1)).findByIdAndTrip(photoId, trip);
+        verify(s3Service, never()).createDownloadUrl(anyString());
+    }
+
+    @Test
+    @DisplayName("movePhotos 성공")
+    void movePhotos_success() {
+        // given
+        Long userId = 1L;
+        Long tripId = 10L;
+        Long targetAlbumId = 100L;
+        List<Long> photoIds = List.of(1000L);
+        Set<Long> uniqueIds = new HashSet<>(photoIds);
+
+        when(tripPermissionService.getEditableTrip(userId, tripId)).thenReturn(trip);
+        when(albumRepository.findByIdAndTrip(targetAlbumId, trip)).thenReturn(Optional.of(album));
+        when(photoRepository.findAllByIdInAndTrip(eq(uniqueIds), eq(trip))).thenReturn(List.of(photo));
+
+        // when
+        photoService.movePhotos(userId, tripId, targetAlbumId, photoIds);
+
+        // then
+        verify(tripPermissionService, times(1)).getEditableTrip(userId, tripId);
+        verify(albumRepository, times(1)).findByIdAndTrip(targetAlbumId, trip);
+        verify(photoRepository, times(1)).findAllByIdInAndTrip(eq(uniqueIds), eq(trip));
+    }
+
+    @Test
+    @DisplayName("movePhotos 성공: photoIds에 중복이 있어도 정상 처리")
+    void movePhotos_success_withDuplicateIds() {
+        // given
+        Long userId = 1L;
+        Long tripId = 10L;
+        Long targetAlbumId = 100L;
+        List<Long> photoIds = List.of(1000L, 1000L);
+        Set<Long> uniqueIds = new HashSet<>(photoIds);
+
+        when(tripPermissionService.getEditableTrip(userId, tripId)).thenReturn(trip);
+        when(albumRepository.findByIdAndTrip(targetAlbumId, trip)).thenReturn(Optional.of(album));
+        when(photoRepository.findAllByIdInAndTrip(eq(uniqueIds), eq(trip))).thenReturn(List.of(photo));
+
+        // when
+        photoService.movePhotos(userId, tripId, targetAlbumId, photoIds);
+
+        // then
+        verify(tripPermissionService, times(1)).getEditableTrip(userId, tripId);
+        verify(albumRepository, times(1)).findByIdAndTrip(targetAlbumId, trip);
+        verify(photoRepository, times(1)).findAllByIdInAndTrip(eq(uniqueIds), eq(trip));
+    }
+
+    @Test
+    @DisplayName("movePhotos 실패: 사진 개수 불일치")
+    void movePhotos_fail_photoNotFound() {
+        // given
+        Long userId = 1L;
+        Long tripId = 10L;
+        Long targetAlbumId = 100L;
+        List<Long> photoIds = List.of(1000L, 1001L, 1002L);
+        Set<Long> uniqueIds = new HashSet<>(photoIds);
+
+        when(tripPermissionService.getEditableTrip(userId, tripId)).thenReturn(trip);
+        when(albumRepository.findByIdAndTrip(targetAlbumId, trip)).thenReturn(Optional.of(album));
+        when(photoRepository.findAllByIdInAndTrip(eq(uniqueIds), eq(trip))).thenReturn(List.of(photo));
+
+        // when & then
+        ApiException ex = assertThrows(ApiException.class,
+            () -> photoService.movePhotos(userId, tripId, targetAlbumId, photoIds));
+
+        assertEquals(ErrorCode.NOT_FOUND_PHOTO, ex.getErrorCode());
+
+        verify(tripPermissionService, times(1)).getEditableTrip(userId, tripId);
+        verify(albumRepository, times(1)).findByIdAndTrip(targetAlbumId, trip);
+        verify(photoRepository, times(1)).findAllByIdInAndTrip(eq(uniqueIds), eq(trip));
+    }
+
+    @Test
+    @DisplayName("deletePhotos 성공")
+    void deletePhotos_success() {
+        // given
+        Long userId = 1L;
+        Long tripId = 10L;
+        List<Long> photoIds = List.of(1000L);
+        Set<Long> uniqueIds = new HashSet<>(photoIds);
+
+        when(tripPermissionService.getEditableTrip(userId, tripId)).thenReturn(trip);
+        when(photoRepository.findAllByIdInAndTrip(eq(uniqueIds), eq(trip))).thenReturn(List.of(photo));
+
+        // when
+        photoService.deletePhotos(userId, tripId, photoIds);
+
+        // then
+        verify(tripPermissionService, times(1)).getEditableTrip(userId, tripId);
+        verify(photoRepository, times(1)).findAllByIdInAndTrip(eq(uniqueIds), eq(trip));
+        verify(s3Service, times(1)).deleteFile(photo.getS3Key());
+        verify(photoRepository, times(1)).deleteAll(List.of(photo));
+    }
+
+    @Test
+    @DisplayName("deletePhotos 실패: 사진 개수 불일치")
+    void deletePhotos_fail_photoNotFound() {
+        // given
+        Long userId = 1L;
+        Long tripId = 10L;
+        List<Long> photoIds = List.of(1000L, 10001L, 10002L);
+        Set<Long> uniqueIds = new HashSet<>(photoIds);
+
+        when(tripPermissionService.getEditableTrip(userId, tripId)).thenReturn(trip);
+        when(photoRepository.findAllByIdInAndTrip(eq(uniqueIds), eq(trip))).thenReturn(List.of(photo));
+
+        // when & then
+        ApiException ex = assertThrows(ApiException.class,
+            () -> photoService.deletePhotos(userId, tripId, photoIds));
+
+        assertEquals(ErrorCode.NOT_FOUND_PHOTO, ex.getErrorCode());
+
+        verify(tripPermissionService, times(1)).getEditableTrip(userId, tripId);
+        verify(photoRepository, times(1)).findAllByIdInAndTrip(eq(uniqueIds), eq(trip));
+        verify(s3Service, never()).deleteFile(anyString());
+        verify(photoRepository, never()).deleteAll(any());
+    }
+}
\ No newline at end of file
diff --git a/src/test/java/com/example/pventure/domain/schedule/service/ScheduleServiceTest.java b/src/test/java/com/example/pventure/domain/schedule/service/ScheduleServiceTest.java
index 3b6920d..c01d367 100644
--- a/src/test/java/com/example/pventure/domain/schedule/service/ScheduleServiceTest.java
+++ b/src/test/java/com/example/pventure/domain/schedule/service/ScheduleServiceTest.java
@@ -34,6 +34,7 @@
 import static org.mockito.Mockito.*;
 
 @ExtendWith(MockitoExtension.class)
+
 class ScheduleServiceTest {
 
     @Mock private ScheduleRepository scheduleRepository;
@@ -120,9 +121,9 @@ void updateSchedule_success() {
         when(scheduleRepository.findById(schedule.getId())).thenReturn(Optional.of(schedule));
         when(memberService.canEdit(user, trip)).thenReturn(true);
 
-        ScheduleUpdateDto dto = new ScheduleUpdateDto(true, "new memo");
+        ScheduleUpdateDto dto = new ScheduleUpdateDto("new memo", true);
         ScheduleResponseDto response = scheduleService.updateSchedule(trip.getId(), schedule.getId(), user.getId(), dto);
-        assertTrue(response.isCompleted());
+        assertTrue(response.getIsCompleted());
     }
 
     @Test
@@ -185,7 +186,7 @@ void updateSchedule_fail_scheduleNotFound() {
         when(scheduleRepository.findById(999L)).thenReturn(Optional.empty());
         when(memberService.canEdit(user, trip)).thenReturn(true);
 
-        ScheduleUpdateDto dto = new ScheduleUpdateDto(true, "memo");
+        ScheduleUpdateDto dto = new ScheduleUpdateDto("memo", true);
         ApiException ex = assertThrows(ApiException.class,
                 () -> scheduleService.updateSchedule(trip.getId(), 999L, user.getId(), dto));
         assertEquals(ErrorCode.NOT_FOUND_SCHEDULE, ex.getErrorCode());