diff --git a/zerver/lib/user_groups.py b/zerver/lib/user_groups.py
index 09fd604662..3427eb50b6 100644
--- a/zerver/lib/user_groups.py
+++ b/zerver/lib/user_groups.py
@@ -101,6 +101,15 @@ def access_user_group_for_setting(
     return user_group
 
 
+def check_user_group_name(group_name: str) -> str:
+    if len(group_name) > UserGroup.MAX_NAME_LENGTH:
+        raise JsonableError(
+            _("User group name cannot exceed {} characters.").format(UserGroup.MAX_NAME_LENGTH)
+        )
+
+    return group_name
+
+
 def user_groups_in_realm_serialized(realm: Realm) -> List[UserGroupDict]:
     """This function is used in do_events_register code path so this code
     should be performant.  We need to do 2 database queries because
diff --git a/zerver/models.py b/zerver/models.py
index 66c5a5386b..7b9e235dd7 100644
--- a/zerver/models.py
+++ b/zerver/models.py
@@ -2234,8 +2234,10 @@ class PasswordTooWeakError(Exception):
 
 
 class UserGroup(models.Model):  # type: ignore[django-manager-missing] # django-stubs cannot resolve the custom CTEManager yet https://github.com/typeddjango/django-stubs/issues/1023
+    MAX_NAME_LENGTH = 100
+
     objects: CTEManager = CTEManager()
-    name = models.CharField(max_length=100)
+    name = models.CharField(max_length=MAX_NAME_LENGTH)
     direct_members = models.ManyToManyField(
         UserProfile, through="UserGroupMembership", related_name="direct_groups"
     )
diff --git a/zerver/tests/test_user_groups.py b/zerver/tests/test_user_groups.py
index 505518d359..52a96f80b6 100644
--- a/zerver/tests/test_user_groups.py
+++ b/zerver/tests/test_user_groups.py
@@ -267,6 +267,16 @@ class UserGroupAPITestCase(UserGroupTestCase):
         self.assert_json_error(result, "User group 'support' already exists.")
         self.assert_length(UserGroup.objects.filter(realm=hamlet.realm), 10)
 
+        # Test we cannot create group with same name again
+        params = {
+            "name": "a" * (UserGroup.MAX_NAME_LENGTH + 1),
+            "members": orjson.dumps([hamlet.id]).decode(),
+            "description": "Test group",
+        }
+        result = self.client_post("/json/user_groups/create", info=params)
+        self.assert_json_error(result, "User group name cannot exceed 100 characters.")
+        self.assert_length(UserGroup.objects.filter(realm=hamlet.realm), 10)
+
     def test_can_mention_group_setting_during_user_group_creation(self) -> None:
         self.login("hamlet")
         hamlet = self.example_user("hamlet")
@@ -411,6 +421,10 @@ class UserGroupAPITestCase(UserGroupTestCase):
         result = self.client_patch(f"/json/user_groups/{lear_test_group.id}", info=params)
         self.assert_json_error(result, "Invalid user group")
 
+        params = {"name": "a" * (UserGroup.MAX_NAME_LENGTH + 1)}
+        result = self.client_patch(f"/json/user_groups/{user_group.id}", info=params)
+        self.assert_json_error(result, "User group name cannot exceed 100 characters.")
+
     def test_update_can_mention_group_setting(self) -> None:
         hamlet = self.example_user("hamlet")
         support_group = check_add_user_group(hamlet.realm, "support", [hamlet], acting_user=None)
diff --git a/zerver/views/user_groups.py b/zerver/views/user_groups.py
index a7cf0bfb88..b37de2d481 100644
--- a/zerver/views/user_groups.py
+++ b/zerver/views/user_groups.py
@@ -26,6 +26,7 @@ from zerver.lib.user_groups import (
     access_user_group_by_id,
     access_user_group_for_setting,
     access_user_groups_as_potential_subgroups,
+    check_user_group_name,
     get_direct_memberships_of_users,
     get_recursive_subgroups_for_groups,
     get_subgroup_ids,
@@ -51,6 +52,7 @@ def add_user_group(
     can_mention_group_id: Optional[int] = REQ(json_validator=check_int, default=None),
 ) -> HttpResponse:
     user_profiles = user_ids_to_users(members, user_profile.realm)
+    name = check_user_group_name(name)
 
     group_settings_map = {}
     request_settings_dict = locals()
@@ -107,6 +109,7 @@ def edit_user_group(
     user_group = access_user_group_by_id(user_group_id, user_profile)
 
     if name is not None and name != user_group.name:
+        name = check_user_group_name(name)
         do_update_user_group_name(user_group, name, acting_user=user_profile)
 
     if description is not None and description != user_group.description: