diff --git a/api_docs/changelog.md b/api_docs/changelog.md
index cbac911dd3..f6d9cc02e8 100644
--- a/api_docs/changelog.md
+++ b/api_docs/changelog.md
@@ -20,6 +20,12 @@ format used by the Zulip server that they are interacting with.
 
 ## Changes in Zulip 8.0
 
+**Feature level 191**
+
+* [`GET /events`](/api/get-events), [`POST /register`](/api/register-queue),
+  [`GET /user_groups`](/api/get-user-groups): Add `can_mention_group_id` to
+  user group objects.
+
 **Feature level 190**
 
 * [`DELETE /realm/emoji/{emoji_name}`](/api/deactivate-custom-emoji): This endpoint
diff --git a/web/tests/lib/events.js b/web/tests/lib/events.js
index f592217bd1..9fba365822 100644
--- a/web/tests/lib/events.js
+++ b/web/tests/lib/events.js
@@ -795,6 +795,7 @@ exports.fixtures = {
             members: [1],
             is_system_group: false,
             direct_subgroup_ids: [2],
+            can_mention_group_id: 11,
         },
     },
 
diff --git a/zerver/actions/user_groups.py b/zerver/actions/user_groups.py
index 6fc9ca9c68..7d8b378143 100644
--- a/zerver/actions/user_groups.py
+++ b/zerver/actions/user_groups.py
@@ -139,6 +139,7 @@ def do_send_create_user_group_event(
             id=user_group.id,
             is_system_group=user_group.is_system_group,
             direct_subgroup_ids=[direct_subgroup.id for direct_subgroup in direct_subgroups],
+            can_mention_group_id=user_group.can_mention_group_id,
         ),
     )
     send_event(user_group.realm, event, active_user_ids(user_group.realm_id))
diff --git a/zerver/lib/event_schema.py b/zerver/lib/event_schema.py
index 218867c824..232c3fae9c 100644
--- a/zerver/lib/event_schema.py
+++ b/zerver/lib/event_schema.py
@@ -1693,6 +1693,7 @@ group_type = DictType(
         ("direct_subgroup_ids", ListType(int)),
         ("description", str),
         ("is_system_group", bool),
+        ("can_mention_group_id", int),
     ]
 )
 
diff --git a/zerver/lib/user_groups.py b/zerver/lib/user_groups.py
index b70931c344..cdeb0b4c97 100644
--- a/zerver/lib/user_groups.py
+++ b/zerver/lib/user_groups.py
@@ -17,6 +17,7 @@ class UserGroupDict(TypedDict):
     members: List[int]
     direct_subgroup_ids: List[int]
     is_system_group: bool
+    can_mention_group_id: int
 
 
 def access_user_group_by_id(
@@ -107,6 +108,7 @@ def user_groups_in_realm_serialized(realm: Realm) -> List[UserGroupDict]:
             members=[],
             direct_subgroup_ids=[],
             is_system_group=user_group.is_system_group,
+            can_mention_group_id=user_group.can_mention_group_id,
         )
 
     membership = UserGroupMembership.objects.filter(user_group__realm=realm).values_list(
diff --git a/zerver/openapi/zulip.yaml b/zerver/openapi/zulip.yaml
index 50f27837a2..5cea26d44c 100644
--- a/zerver/openapi/zulip.yaml
+++ b/zerver/openapi/zulip.yaml
@@ -2906,6 +2906,7 @@ paths:
                                       "description": "Backend team",
                                       "id": 2,
                                       "is_system_group": false,
+                                      "can_mention_group_id": 11,
                                     },
                                   "id": 0,
                                 }
@@ -16401,6 +16402,13 @@ paths:
                                 modified by users.
 
                                 **Changes**: New in Zulip 5.0 (feature level 93).
+                            can_mention_group_id:
+                              type: integer
+                              description: |
+                                ID of the user group whose members are allowed to mention the group.
+
+                                **Changes**: New in Zulip 8.0 (feature level 191). Previously, groups
+                                could be mentioned if and only if they were not system groups.
                         description: |
                           A list of `user_group` objects.
                     example:
@@ -16416,6 +16424,7 @@ paths:
                               "members": [1],
                               "direct_subgroup_ids": [],
                               "is_system_group": true,
+                              "can_mention_group_id": 11,
                             },
                             {
                               "description": "Administrators of this organization, including owners",
@@ -16424,6 +16433,7 @@ paths:
                               "members": [2],
                               "direct_subgroup_ids": [1],
                               "is_system_group": true,
+                              "can_mention_group_id": 12,
                             },
                             {
                               "description": "Characters of Hamlet",
@@ -16432,6 +16442,7 @@ paths:
                               "members": [3, 4],
                               "direct_subgroup_ids": [],
                               "is_system_group": false,
+                              "can_mention_group_id": 13,
                             },
                           ],
                       }
@@ -17399,6 +17410,13 @@ components:
             directly modified by users.
 
             **Changes**: New in Zulip 5.0 (feature level 93).
+        can_mention_group_id:
+          type: integer
+          description: |
+            ID of the user group whose members are allowed to mention the group.
+
+            **Changes**: New in Zulip 8.0 (feature level 191). Previously, groups
+            could be mentioned if and only if they were not system groups.
     Subscriptions:
       type: object
       additionalProperties: false