diff --git a/slack_bolt/app/app.py b/slack_bolt/app/app.py
index c72394821..f7761773e 100644
--- a/slack_bolt/app/app.py
+++ b/slack_bolt/app/app.py
@@ -877,6 +877,7 @@ def function(
         callback_id: Union[str, Pattern],
         matchers: Optional[Sequence[Callable[..., bool]]] = None,
         middleware: Optional[Sequence[Union[Callable, Middleware]]] = None,
+        auto_acknowledge: bool = True,
     ) -> Callable[..., Optional[Callable[..., Optional[BoltResponse]]]]:
         """Registers a new Function listener.
         This method can be used as either a decorator or a method.
@@ -911,7 +912,7 @@ def reverse_string(ack: Ack, inputs: dict, complete: Complete, fail: Fail):
         def __call__(*args, **kwargs):
             functions = self._to_listener_functions(kwargs) if kwargs else list(args)
             primary_matcher = builtin_matchers.function_executed(callback_id=callback_id, base_logger=self._base_logger)
-            return self._register_listener(functions, primary_matcher, matchers, middleware, True)
+            return self._register_listener(functions, primary_matcher, matchers, middleware, auto_acknowledge)
 
         return __call__
 
diff --git a/slack_bolt/app/async_app.py b/slack_bolt/app/async_app.py
index 92bad71b7..febf2464c 100644
--- a/slack_bolt/app/async_app.py
+++ b/slack_bolt/app/async_app.py
@@ -911,6 +911,7 @@ def function(
         callback_id: Union[str, Pattern],
         matchers: Optional[Sequence[Callable[..., Awaitable[bool]]]] = None,
         middleware: Optional[Sequence[Union[Callable, AsyncMiddleware]]] = None,
+        auto_acknowledge: bool = True,
     ) -> Callable[..., Optional[Callable[..., Awaitable[BoltResponse]]]]:
         """Registers a new Function listener.
         This method can be used as either a decorator or a method.
@@ -947,7 +948,7 @@ def __call__(*args, **kwargs):
             primary_matcher = builtin_matchers.function_executed(
                 callback_id=callback_id, base_logger=self._base_logger, asyncio=True
             )
-            return self._register_listener(functions, primary_matcher, matchers, middleware, True)
+            return self._register_listener(functions, primary_matcher, matchers, middleware, auto_acknowledge)
 
         return __call__
 
diff --git a/tests/scenario_tests/test_function.py b/tests/scenario_tests/test_function.py
index d00898082..00f0efba8 100644
--- a/tests/scenario_tests/test_function.py
+++ b/tests/scenario_tests/test_function.py
@@ -112,6 +112,32 @@ def test_invalid_declaration(self):
         with pytest.raises(TypeError):
             func("hello world")
 
+    def test_auto_acknowledge_false_with_acknowledging(self):
+        app = App(
+            client=self.web_client,
+            signing_secret=self.signing_secret,
+        )
+        app.function("reverse", auto_acknowledge=False)(just_ack)
+
+        request = self.build_request_from_body(function_body)
+        response = app.dispatch(request)
+        assert response.status == 200
+        assert_auth_test_count(self, 1)
+
+    def test_auto_acknowledge_false_without_acknowledging(self, caplog):
+        app = App(
+            client=self.web_client,
+            signing_secret=self.signing_secret,
+        )
+        app.function("reverse", auto_acknowledge=False)(just_no_ack)
+
+        request = self.build_request_from_body(function_body)
+        response = app.dispatch(request)
+
+        assert response.status == 404
+        assert_auth_test_count(self, 1)
+        assert f"WARNING {just_no_ack.__name__} didn't call ack()" in caplog.text
+
 
 function_body = {
     "token": "verification_token",
@@ -230,3 +256,14 @@ def complete_it(body, event, complete):
     assert body == function_body
     assert event == function_body["event"]
     complete(outputs={})
+
+
+def just_ack(ack, body, event):
+    assert body == function_body
+    assert event == function_body["event"]
+    ack()
+
+
+def just_no_ack(body, event):
+    assert body == function_body
+    assert event == function_body["event"]
diff --git a/tests/scenario_tests_async/test_function.py b/tests/scenario_tests_async/test_function.py
index 0aefd7774..a2c10950c 100644
--- a/tests/scenario_tests_async/test_function.py
+++ b/tests/scenario_tests_async/test_function.py
@@ -116,6 +116,33 @@ async def test_invalid_callback_id(self):
         assert response.status == 404
         await assert_auth_test_count_async(self, 1)
 
+    @pytest.mark.asyncio
+    async def test_auto_acknowledge_false_with_acknowledging(self):
+        app = AsyncApp(
+            client=self.web_client,
+            signing_secret=self.signing_secret,
+        )
+        app.function("reverse", auto_acknowledge=False)(just_ack)
+
+        request = self.build_request_from_body(function_body)
+        response = await app.async_dispatch(request)
+        assert response.status == 200
+        await assert_auth_test_count_async(self, 1)
+
+    @pytest.mark.asyncio
+    async def test_auto_acknowledge_false_without_acknowledging(self, caplog):
+        app = AsyncApp(
+            client=self.web_client,
+            signing_secret=self.signing_secret,
+        )
+        app.function("reverse", auto_acknowledge=False)(just_no_ack)
+
+        request = self.build_request_from_body(function_body)
+        response = await app.async_dispatch(request)
+        assert response.status == 404
+        await assert_auth_test_count_async(self, 1)
+        assert f"WARNING {just_no_ack.__name__} didn't call ack()" in caplog.text
+
 
 function_body = {
     "token": "verification_token",
@@ -238,3 +265,14 @@ async def complete_it(body, event, complete):
     await complete(
         outputs={},
     )
+
+
+async def just_ack(ack, body, event):
+    assert body == function_body
+    assert event == function_body["event"]
+    await ack()
+
+
+async def just_no_ack(body, event):
+    assert body == function_body
+    assert event == function_body["event"]