diff --git a/Sources/remindctl/Commands/ListCommand.swift b/Sources/remindctl/Commands/ListCommand.swift
index ac20ba8..ba53d1e 100644
--- a/Sources/remindctl/Commands/ListCommand.swift
+++ b/Sources/remindctl/Commands/ListCommand.swift
@@ -7,7 +7,7 @@ enum ListCommand {
     CommandSpec(
       name: "list",
       abstract: "List reminder lists or show list contents",
-      discussion: "Without a name, shows all lists. With a name, shows reminders in that list.",
+      discussion: "Without a name, shows all lists. With one or more names, shows reminders in those lists. Management actions remain single-list only.",
       signature: CommandSignatures.withRuntimeFlags(
         CommandSignature(
           arguments: [
@@ -31,21 +31,28 @@ enum ListCommand {
       usageExamples: [
         "remindctl list",
         "remindctl list Work",
+        "remindctl list Work Personal",
         "remindctl list Work --rename Office",
         "remindctl list Work --delete",
         "remindctl list Projects --create",
       ]
     ) { values, runtime in
-      let name = values.argument(0)
+      let listNames = requestedListNames(from: values.positional)
       let renameTo = values.option("rename")
       let deleteList = values.flag("delete")
       let createList = values.flag("create")
       let force = values.flag("force")
+      try validateSingleTargetAction(
+        listNames: listNames,
+        renameTo: renameTo,
+        delete: deleteList,
+        create: createList
+      )
 
       let store = RemindersStore()
       try await store.requestAccess()
 
-      if let name {
+      if let name = listNames.first {
         if deleteList {
           if !force && !runtime.noInput && Console.isTTY {
             if !Console.confirm("Delete list \"\(name)\"?", defaultValue: false) {
@@ -80,7 +87,18 @@ enum ListCommand {
           return
         }
 
-        let reminders = try await store.reminders(in: name)
+        if listNames.count == 1 {
+          let reminders = try await store.reminders(in: name)
+          OutputRenderer.printReminders(reminders, format: runtime.outputFormat)
+          return
+        }
+
+        var reminderGroups: [[ReminderItem]] = []
+        reminderGroups.reserveCapacity(listNames.count)
+        for listName in listNames {
+          reminderGroups.append(try await store.reminders(in: listName))
+        }
+        let reminders = mergeReminderGroups(reminderGroups)
         OutputRenderer.printReminders(reminders, format: runtime.outputFormat)
         return
       }
@@ -109,4 +127,43 @@ enum ListCommand {
       OutputRenderer.printLists(summaries, format: runtime.outputFormat)
     }
   }
+
+  static func requestedListNames(from positional: [String]) -> [String] {
+    positional.compactMap { rawName in
+      let name = rawName.trimmingCharacters(in: .whitespacesAndNewlines)
+      return name.isEmpty ? nil : name
+    }
+  }
+
+  static func validateSingleTargetAction(
+    listNames: [String],
+    renameTo: String?,
+    delete: Bool,
+    create: Bool
+  ) throws {
+    guard listNames.count > 1 else { return }
+
+    if renameTo != nil {
+      throw RemindCoreError.operationFailed("--rename requires exactly one list name")
+    }
+    if delete {
+      throw RemindCoreError.operationFailed("--delete requires exactly one list name")
+    }
+    if create {
+      throw RemindCoreError.operationFailed("--create requires exactly one list name")
+    }
+  }
+
+  static func mergeReminderGroups(_ groups: [[ReminderItem]]) -> [ReminderItem] {
+    var merged: [ReminderItem] = []
+    var seenIDs = Set<String>()
+
+    for group in groups {
+      for reminder in group where seenIDs.insert(reminder.id).inserted {
+        merged.append(reminder)
+      }
+    }
+
+    return merged
+  }
 }
diff --git a/Tests/remindctlTests/ListCommandTests.swift b/Tests/remindctlTests/ListCommandTests.swift
new file mode 100644
index 0000000..d98700e
--- /dev/null
+++ b/Tests/remindctlTests/ListCommandTests.swift
@@ -0,0 +1,99 @@
+import Foundation
+import Testing
+
+@testable import RemindCore
+@testable import remindctl
+
+@MainActor
+struct ListCommandTests {
+  @Test("Requested list names preserve order and trim whitespace")
+  func requestedListNamesPreserveOrder() {
+    let names = ListCommand.requestedListNames(from: ["  Grocery Store  ", "COSTCO", " Personal "])
+    #expect(names == ["Grocery Store", "COSTCO", "Personal"])
+  }
+
+  @Test("Requested list names drop empty inputs")
+  func requestedListNamesDropEmptyInputs() {
+    let names = ListCommand.requestedListNames(from: ["", "  ", "\n", "Work"])
+    #expect(names == ["Work"])
+  }
+
+  @Test("Management actions reject multiple list names")
+  func managementActionsRejectMultipleNames() {
+    #expect(throws: RemindCoreError.operationFailed("--rename requires exactly one list name")) {
+      try ListCommand.validateSingleTargetAction(
+        listNames: ["Work", "Personal"],
+        renameTo: "Office",
+        delete: false,
+        create: false
+      )
+    }
+
+    #expect(throws: RemindCoreError.operationFailed("--delete requires exactly one list name")) {
+      try ListCommand.validateSingleTargetAction(
+        listNames: ["Work", "Personal"],
+        renameTo: nil,
+        delete: true,
+        create: false
+      )
+    }
+
+    #expect(throws: RemindCoreError.operationFailed("--create requires exactly one list name")) {
+      try ListCommand.validateSingleTargetAction(
+        listNames: ["Work", "Personal"],
+        renameTo: nil,
+        delete: false,
+        create: true
+      )
+    }
+  }
+
+  @Test("Reminder groups merge by id and preserve first-seen order")
+  func mergeReminderGroupsPreservesFirstSeenOrder() {
+    let work = [
+      makeReminder(id: "1", title: "Alpha", listID: "work", listName: "Work"),
+      makeReminder(id: "2", title: "Beta", listID: "work", listName: "Work"),
+    ]
+    let personal = [
+      makeReminder(id: "2", title: "Beta duplicate", listID: "personal", listName: "Personal"),
+      makeReminder(id: "3", title: "Gamma", listID: "personal", listName: "Personal"),
+    ]
+
+    let merged = ListCommand.mergeReminderGroups([work, personal])
+
+    #expect(merged.map(\.id) == ["1", "2", "3"])
+    #expect(merged.map(\.title) == ["Alpha", "Beta", "Gamma"])
+  }
+
+  @Test("Repeated list groups do not duplicate reminders")
+  func repeatedListGroupsDoNotDuplicateOutput() {
+    let groceries = [
+      makeReminder(id: "1", title: "Milk", listID: "groceries", listName: "Groceries"),
+      makeReminder(id: "2", title: "Eggs", listID: "groceries", listName: "Groceries"),
+    ]
+
+    let merged = ListCommand.mergeReminderGroups([groceries, groceries])
+
+    #expect(merged.map(\.id) == ["1", "2"])
+  }
+
+  @Test("List help includes multi-list example")
+  func listHelpIncludesMultiListExample() {
+    #expect(ListCommand.spec.discussion?.contains("one or more names") == true)
+    #expect(ListCommand.spec.usageExamples.contains("remindctl list Work Personal"))
+  }
+
+  private func makeReminder(id: String, title: String, listID: String, listName: String) -> ReminderItem {
+    ReminderItem(
+      id: id,
+      title: title,
+      notes: nil,
+      isCompleted: false,
+      completionDate: nil,
+      priority: .none,
+      dueDate: nil,
+      listID: listID,
+      listName: listName
+    )
+  }
+}