diff --git a/packages/2-mongo-family/5-query-builders/orm/src/compile.ts b/packages/2-mongo-family/5-query-builders/orm/src/compile.ts
index d6c0eb9979e0..c08f34548ef5 100644
--- a/packages/2-mongo-family/5-query-builders/orm/src/compile.ts
+++ b/packages/2-mongo-family/5-query-builders/orm/src/compile.ts
@@ -73,6 +73,9 @@ export function compileMongoQuery<Row = unknown>(
     for (const field of state.selectedFields) {
       projection[field] = 1;
     }
+    for (const inc of state.includes) {
+      projection[inc.relationName] = 1;
+    }
     if (!Object.hasOwn(projection, '_id')) {
       projection['_id'] = 0;
     }
diff --git a/packages/2-mongo-family/5-query-builders/orm/test/compile.test.ts b/packages/2-mongo-family/5-query-builders/orm/test/compile.test.ts
index 536e68773f8a..71c6b2848241 100644
--- a/packages/2-mongo-family/5-query-builders/orm/test/compile.test.ts
+++ b/packages/2-mongo-family/5-query-builders/orm/test/compile.test.ts
@@ -300,4 +300,51 @@ describe('compileMongoQuery', () => {
       expect(plan.resultShape.fields['author']?.kind).toBe('unknown');
     });
   });
+
+  describe('select combined with include', () => {
+    it('$project retains to-many relation alias from includes', () => {
+      const state: MongoCollectionState = {
+        ...emptyCollectionState(),
+        selectedFields: ['name'],
+        includes: [
+          {
+            relationName: 'posts',
+            from: 'posts',
+            localField: '_id',
+            foreignField: 'authorId',
+            cardinality: '1:N',
+          },
+        ],
+      };
+      const plan = compileMongoQuery('users', state, testHash, testUserModel);
+      const projectStage = stages(plan).find((s) => s.kind === 'project') as
+        | MongoProjectStage
+        | undefined;
+      expect(projectStage).toBeDefined();
+      expect(projectStage!.projection).toEqual({ name: 1, posts: 1, _id: 0 });
+    });
+
+    it('$project retains to-one relation alias from includes', () => {
+      const state: MongoCollectionState = {
+        ...emptyCollectionState(),
+        selectedFields: ['title'],
+        includes: [
+          {
+            relationName: 'author',
+            from: 'users',
+            localField: 'authorId',
+            foreignField: '_id',
+            cardinality: 'N:1',
+          },
+        ],
+      };
+      const plan = compileMongoQuery('posts', state, testHash, testPostModel);
+      expect(stages(plan).map((s) => s.kind)).toEqual(['lookup', 'unwind', 'project']);
+      const projectStage = stages(plan).find((s) => s.kind === 'project') as
+        | MongoProjectStage
+        | undefined;
+      expect(projectStage).toBeDefined();
+      expect(projectStage!.projection).toEqual({ title: 1, author: 1, _id: 0 });
+    });
+  });
 });
diff --git a/packages/2-mongo-family/5-query-builders/orm/test/integration/orm-ergonomics.test.ts b/packages/2-mongo-family/5-query-builders/orm/test/integration/orm-ergonomics.test.ts
index f6e186ce1a35..01fe4a792dd7 100644
--- a/packages/2-mongo-family/5-query-builders/orm/test/integration/orm-ergonomics.test.ts
+++ b/packages/2-mongo-family/5-query-builders/orm/test/integration/orm-ergonomics.test.ts
@@ -266,5 +266,52 @@ describe('ORM ergonomics integration (FL-04, FL-06, FL-08)', {
       const tasks = (result as Record<string, unknown>)['tasks'] as unknown[];
       expect(tasks).toEqual([]);
     });
+
+    it('select() keeps a 1:N include whose join key is not selected', async () => {
+      const orm = mongoOrm({ contract, executor: runtime });
+      const user = await orm.users.create(defaultUserData);
+      await orm.tasks.create({
+        title: 'Task 1',
+        type: 'bug',
+        assigneeId: user._id as string,
+      } as never);
+
+      const result = await orm.users
+        .select('name')
+        .include('tasks')
+        .where({ _id: user._id as string })
+        .first();
+
+      expect(result).toEqual({
+        name: 'Alice',
+        tasks: [
+          { _id: expect.anything(), title: 'Task 1', type: 'bug', assigneeId: expect.anything() },
+        ],
+      });
+    });
+
+    it('select() keeps an N:1 include whose join key is not selected', async () => {
+      const orm = mongoOrm({ contract, executor: runtime });
+      const user = await orm.users.create(defaultUserData);
+      await orm.tasks.create({
+        title: 'Task 1',
+        type: 'bug',
+        assigneeId: user._id as string,
+      } as never);
+
+      const result = await orm.tasks.select('title').include('assignee').first();
+
+      expect(result).toEqual({
+        title: 'Task 1',
+        assignee: {
+          _id: expect.anything(),
+          name: 'Alice',
+          email: 'alice@test.com',
+          loginCount: 0,
+          tags: [],
+          homeAddress: null,
+        },
+      });
+    });
   });
 });