diff --git a/services/api/src/routers/decision/proposals/submit.ts b/services/api/src/routers/decision/proposals/submit.ts
index a43679a74..57801f9cd 100644
--- a/services/api/src/routers/decision/proposals/submit.ts
+++ b/services/api/src/routers/decision/proposals/submit.ts
@@ -1,4 +1,5 @@
 import { submitProposal } from '@op/common';
+import { Events, inngest } from '@op/events';
 import { waitUntil } from '@vercel/functions';
 import { z } from 'zod';
 
@@ -29,6 +30,14 @@ export const submitProposalRouter = router({
         }),
       );
 
+      // Send proposal submitted event for notification workflow
+      waitUntil(
+        inngest.send({
+          name: Events.proposalSubmitted.name,
+          data: { proposalId: proposal.id },
+        }),
+      );
+
       return proposalEncoder.parse(proposal);
     }),
 });
diff --git a/services/api/src/test/setup.ts b/services/api/src/test/setup.ts
index 2abe600f6..0976d6588 100644
--- a/services/api/src/test/setup.ts
+++ b/services/api/src/test/setup.ts
@@ -60,10 +60,14 @@ const mockPlatformAdminEmails = {
 // Mock the event system to avoid Inngest API calls in tests
 vi.mock('@op/events', async () => {
   const actual = await vi.importActual('@op/events');
+  const mockSend = vi.fn().mockResolvedValue({ ids: ['mock-event-id'] });
   return {
     ...actual,
+    inngest: {
+      send: mockSend,
+    },
     event: {
-      send: vi.fn().mockResolvedValue({ ids: ['mock-event-id'] }),
+      send: mockSend,
     },
   };
 });
diff --git a/services/emails/emails/ProposalSubmittedEmail.tsx b/services/emails/emails/ProposalSubmittedEmail.tsx
new file mode 100644
index 000000000..5730f9bd6
--- /dev/null
+++ b/services/emails/emails/ProposalSubmittedEmail.tsx
@@ -0,0 +1,66 @@
+import { Button, Heading, Section, Text } from '@react-email/components';
+
+import EmailTemplate from '../components/EmailTemplate';
+
+export const ProposalSubmittedEmail = ({
+  proposalName,
+  processTitle,
+  proposalUrl = 'https://common.oneproject.org/',
+}: {
+  proposalName?: string | null;
+  processTitle?: string | null;
+  proposalUrl: string;
+}) => {
+  const displayName = proposalName || 'Your proposal';
+
+  return (
+    <EmailTemplate
+      previewText={
+        processTitle
+          ? `Your proposal "${displayName}" has been submitted to ${processTitle}`
+          : `Your proposal "${displayName}" has been submitted`
+      }
+    >
+      <Heading className="mx-0 !my-0 p-0 text-left font-serif text-[28px] font-light tracking-[-0.02625rem] text-[#222D38]">
+        Proposal Submitted
+      </Heading>
+      <Text className="my-8 text-lg">
+        Your proposal <strong>{displayName}</strong> has been submitted
+        {processTitle ? (
+          <>
+            {' '}
+            to <strong>{processTitle}</strong>
+          </>
+        ) : null}
+        .
+      </Text>
+
+      <Section className="pb-0">
+        <Button
+          href={proposalUrl}
+          className="rounded-lg bg-primary-teal px-4 py-3 text-white no-underline hover:bg-primary-teal/90"
+          style={{
+            fontSize: '0.875rem',
+            textAlign: 'center',
+            textDecoration: 'none',
+          }}
+        >
+          View proposal
+        </Button>
+      </Section>
+    </EmailTemplate>
+  );
+};
+
+ProposalSubmittedEmail.subject = (
+  proposalName?: string | null,
+  processTitle?: string | null,
+) => {
+  const displayName = proposalName || 'Your proposal';
+  if (processTitle) {
+    return `Your proposal "${displayName}" has been submitted to ${processTitle}`;
+  }
+  return `Your proposal "${displayName}" has been submitted`;
+};
+
+export default ProposalSubmittedEmail;
diff --git a/services/emails/index.tsx b/services/emails/index.tsx
index caaa38363..28e159df8 100644
--- a/services/emails/index.tsx
+++ b/services/emails/index.tsx
@@ -115,3 +115,4 @@ export * from './emails/OPInvitationEmail';
 export * from './emails/OPRelationshipRequestEmail';
 export * from './emails/CommentNotificationEmail';
 export * from './emails/ReactionNotificationEmail';
+export * from './emails/ProposalSubmittedEmail';
diff --git a/services/events/src/types.ts b/services/events/src/types.ts
index d69427dec..ef60fd608 100644
--- a/services/events/src/types.ts
+++ b/services/events/src/types.ts
@@ -42,4 +42,10 @@ export const Events = {
       ),
     }),
   },
+  proposalSubmitted: {
+    name: 'proposal/submitted' as const,
+    schema: z.object({
+      proposalId: z.string().uuid(),
+    }),
+  },
 } as const;
diff --git a/services/workflows/src/functions/notifications/index.ts b/services/workflows/src/functions/notifications/index.ts
index c84004652..8d4d4f4f6 100644
--- a/services/workflows/src/functions/notifications/index.ts
+++ b/services/workflows/src/functions/notifications/index.ts
@@ -1,2 +1,3 @@
 export * from './sendReactionNotification';
 export * from './sendProfileInviteEmails';
+export * from './sendProposalSubmittedNotification';
diff --git a/services/workflows/src/functions/notifications/sendProposalSubmittedNotification.ts b/services/workflows/src/functions/notifications/sendProposalSubmittedNotification.ts
new file mode 100644
index 000000000..b5d54ed66
--- /dev/null
+++ b/services/workflows/src/functions/notifications/sendProposalSubmittedNotification.ts
@@ -0,0 +1,118 @@
+import { OPURLConfig } from '@op/core';
+import { db } from '@op/db/client';
+import {
+  processInstances,
+  profileUsers,
+  profiles,
+  proposals,
+} from '@op/db/schema';
+import { OPBatchSend, ProposalSubmittedEmail } from '@op/emails';
+import { Events, inngest } from '@op/events';
+import { eq } from 'drizzle-orm';
+import { alias } from 'drizzle-orm/pg-core';
+
+const { proposalSubmitted } = Events;
+
+export const sendProposalSubmittedNotification = inngest.createFunction(
+  {
+    id: 'sendProposalSubmittedNotification',
+    debounce: {
+      key: 'event.data.proposalId',
+      period: '1m',
+      timeout: '3m',
+    },
+  },
+  { event: proposalSubmitted.name },
+  async ({ event, step }) => {
+    const { proposalId } = proposalSubmitted.schema.parse(event.data);
+
+    const proposalProfile = alias(profiles, 'proposal_profile');
+    const processProfile = alias(profiles, 'process_profile');
+
+    // Step 1: Get proposal, its profile name, and the process instance profile (name + slug)
+    const proposalData = await step.run('get-proposal-data', async () => {
+      const result = await db
+        .select({
+          proposalProfileId: proposals.profileId,
+          proposalProfileName: proposalProfile.name,
+          processProfileName: processProfile.name,
+          processProfileSlug: processProfile.slug,
+        })
+        .from(proposals)
+        .innerJoin(proposalProfile, eq(proposals.profileId, proposalProfile.id))
+        .innerJoin(
+          processInstances,
+          eq(proposals.processInstanceId, processInstances.id),
+        )
+        .innerJoin(
+          processProfile,
+          eq(processInstances.profileId, processProfile.id),
+        )
+        .where(eq(proposals.id, proposalId))
+        .limit(1);
+
+      return result[0];
+    });
+
+    if (!proposalData) {
+      console.log('No proposal data found for proposal:', proposalId);
+      return;
+    }
+
+    // Step 2: Get all collaborator emails
+    const collaborators = await step.run('get-collaborators', async () => {
+      return db
+        .select({
+          email: profileUsers.email,
+        })
+        .from(profileUsers)
+        .where(eq(profileUsers.profileId, proposalData.proposalProfileId));
+    });
+
+    if (collaborators.length === 0) {
+      console.log('No collaborators found for proposal:', proposalId);
+      return;
+    }
+
+    const proposalUrl = `${OPURLConfig('APP').ENV_URL}/decisions/${proposalData.processProfileSlug}/proposal/${proposalData.proposalProfileId}`;
+
+    // Step 3: Send notification emails to all collaborators
+    const result = await step.run('send-emails', async () => {
+      try {
+        const emails = collaborators.map(({ email }) => ({
+          to: email,
+          subject: ProposalSubmittedEmail.subject(
+            proposalData.proposalProfileName,
+            proposalData.processProfileName,
+          ),
+          component: () =>
+            ProposalSubmittedEmail({
+              proposalName: proposalData.proposalProfileName,
+              processTitle: proposalData.processProfileName,
+              proposalUrl,
+            }),
+        }));
+
+        const { data, errors } = await OPBatchSend(emails);
+
+        if (errors.length > 0) {
+          throw Error(`Email batch failed: ${JSON.stringify(errors)}`);
+        }
+
+        return {
+          sent: data.length,
+        };
+      } catch (error) {
+        console.error('Failed to send proposal submitted notifications:', {
+          error,
+          proposalId,
+        });
+        throw error;
+      }
+    });
+
+    return {
+      message: `${result.sent} proposal submitted notification(s) sent`,
+    };
+  },
+);