diff --git a/src/messages/messages.service.ts b/src/messages/messages.service.ts
index 97a6dba..84508bb 100644
--- a/src/messages/messages.service.ts
+++ b/src/messages/messages.service.ts
@@ -562,6 +562,21 @@ export class MessagesService {
       data: isUser ? { userUnreadCount: 0 } : { agentUnreadCount: 0 },
     });
 
+    // Also mark related message notifications as read for this user
+    // Notifications store conversationId in the JSON `data` field
+    await this.prisma.notification.updateMany({
+      where: {
+        userId,
+        type: 'message',
+        read: false,
+        data: {
+          path: ['conversationId'],
+          equals: conversationId,
+        },
+      },
+      data: { read: true },
+    });
+
     return { success: true };
   }