diff --git a/api_docs/changelog.md b/api_docs/changelog.md
index 32142d60d4..d099b5c3b3 100644
--- a/api_docs/changelog.md
+++ b/api_docs/changelog.md
@@ -20,6 +20,13 @@ format used by the Zulip server that they are interacting with.
 
 ## Changes in Zulip 7.0
 
+**Feature level 171**:
+
+* [`POST /fetch_api_key`](/api/fetch-api-key),
+  [`POST /dev_fetch_api_key`](/api/dev-fetch-api-key): The return values
+  for these endpoints now include the unique ID of the user who owns the
+  API key.
+
 **Feature level 170**
 
 * [`POST /user_topics`](/api/update-user-topic):
diff --git a/version.py b/version.py
index a6cc7be92f..bdef248041 100644
--- a/version.py
+++ b/version.py
@@ -33,7 +33,7 @@ DESKTOP_WARNING_VERSION = "5.4.3"
 # Changes should be accompanied by documentation explaining what the
 # new level means in api_docs/changelog.md, as well as "**Changes**"
 # entries in the endpoint's documentation in `zulip.yaml`.
-API_FEATURE_LEVEL = 170
+API_FEATURE_LEVEL = 171
 
 # Bump the minor PROVISION_VERSION to indicate that folks should provision
 # only when going from an old version of the code to a newer version. Bump
diff --git a/zerver/openapi/zulip.yaml b/zerver/openapi/zulip.yaml
index fc45f3e3d9..fc2c17a7f0 100644
--- a/zerver/openapi/zulip.yaml
+++ b/zerver/openapi/zulip.yaml
@@ -17342,13 +17342,20 @@ components:
             email:
               type: string
               description: |
-                The email address of the user who owns the API key
+                The email address of the user who owns the API key.
+            user_id:
+              type: integer
+              description: |
+                The unique ID of the user who owns the API key.
+
+                **Changes**: New in Zulip 7.0 (feature level 171).
           example:
             {
               "api_key": "gjA04ZYcqXKalvYMA8OeXSfzUOLrtbZv",
               "email": "iago@zulip.com",
               "msg": "",
               "result": "success",
+              "user_id": 5,
             }
     CodedError:
       allOf:
diff --git a/zerver/tests/test_auth_backends.py b/zerver/tests/test_auth_backends.py
index c032d46d8a..b6577c6c0c 100644
--- a/zerver/tests/test_auth_backends.py
+++ b/zerver/tests/test_auth_backends.py
@@ -4460,7 +4460,8 @@ class FetchAPIKeyTest(ZulipTestCase):
             "/api/v1/fetch_api_key",
             dict(username=self.email, password=initial_password(self.email)),
         )
-        self.assert_json_success(result)
+        json_response = self.assert_json_success(result)
+        self.assertEqual(json_response["user_id"], self.user_profile.id)
 
     def test_invalid_email(self) -> None:
         result = self.client_post(
@@ -4500,7 +4501,8 @@ class FetchAPIKeyTest(ZulipTestCase):
                 "/api/v1/fetch_api_key",
                 dict(username=self.example_email("hamlet"), password=self.ldap_password("hamlet")),
             )
-        self.assert_json_success(result)
+        json_response = self.assert_json_success(result)
+        self.assertEqual(json_response["user_id"], self.user_profile.id)
 
     @override_settings(
         AUTHENTICATION_BACKENDS=("zproject.backends.ZulipLDAPAuthBackend",),
@@ -4530,7 +4532,8 @@ class FetchAPIKeyTest(ZulipTestCase):
             "/api/v1/fetch_api_key",
             dict(username="hamlet", password=self.ldap_password("hamlet")),
         )
-        self.assert_json_success(result)
+        json_response = self.assert_json_success(result)
+        self.assertEqual(json_response["user_id"], self.user_profile.id)
 
     @override_settings(
         AUTHENTICATION_BACKENDS=("zproject.backends.ZulipLDAPAuthBackend",),
@@ -4663,6 +4666,7 @@ class DevFetchAPIKeyTest(ZulipTestCase):
         result = self.client_post("/api/v1/dev_fetch_api_key", dict(username=self.email))
         data = self.assert_json_success(result)
         self.assertEqual(data["email"], self.email)
+        self.assertEqual(data["user_id"], self.user_profile.id)
         user_api_keys = get_all_api_keys(self.user_profile)
         self.assertIn(data["api_key"], user_api_keys)
 
diff --git a/zerver/views/auth.py b/zerver/views/auth.py
index eda081806b..4da27e8204 100644
--- a/zerver/views/auth.py
+++ b/zerver/views/auth.py
@@ -1000,7 +1000,10 @@ def api_fetch_api_key(
 
     api_key = process_api_key_fetch_authenticate_result(request, user_profile)
 
-    return json_success(request, data={"api_key": api_key, "email": user_profile.delivery_email})
+    return json_success(
+        request,
+        data={"api_key": api_key, "email": user_profile.delivery_email, "user_id": user_profile.id},
+    )
 
 
 def get_auth_backends_data(request: HttpRequest) -> Dict[str, Any]:
diff --git a/zerver/views/development/dev_login.py b/zerver/views/development/dev_login.py
index d818f12d30..f42f53a35e 100644
--- a/zerver/views/development/dev_login.py
+++ b/zerver/views/development/dev_login.py
@@ -135,7 +135,10 @@ def api_dev_fetch_api_key(request: HttpRequest, username: str = REQ()) -> HttpRe
 
     do_login(request, user_profile)
     api_key = get_api_key(user_profile)
-    return json_success(request, data={"api_key": api_key, "email": user_profile.delivery_email})
+    return json_success(
+        request,
+        data={"api_key": api_key, "email": user_profile.delivery_email, "user_id": user_profile.id},
+    )
 
 
 @csrf_exempt