diff --git a/doc/source/user/proxies/identity_v3.rst b/doc/source/user/proxies/identity_v3.rst
index 548abf4ca..fe02e2fbc 100644
--- a/doc/source/user/proxies/identity_v3.rst
+++ b/doc/source/user/proxies/identity_v3.rst
@@ -84,6 +84,7 @@ User Operations
 .. autoclass:: openstack.identity.v3._proxy.Proxy
   :noindex:
   :members: create_user, update_user, delete_user, get_user, find_user, users,
+            user_groups
 
 Trust Operations
 ^^^^^^^^^^^^^^^^
diff --git a/doc/source/user/resources/identity/v3/group.rst b/doc/source/user/resources/identity/v3/group.rst
index fe6c4462a..d1215113d 100644
--- a/doc/source/user/resources/identity/v3/group.rst
+++ b/doc/source/user/resources/identity/v3/group.rst
@@ -10,3 +10,12 @@ The ``Group`` class inherits from :class:`~openstack.resource.Resource`.
 
 .. autoclass:: openstack.identity.v3.group.Group
    :members:
+
+The UserGroup Class
+-------------------
+
+The ``UserGroup`` class inherits from
+:class:`~openstack.identity.v3.group.Group`
+
+.. autoclass:: openstack.identity.v3.group.UserGroup
+   :members:
diff --git a/openstack/identity/v3/_proxy.py b/openstack/identity/v3/_proxy.py
index 84c9ef25a..207ba661c 100644
--- a/openstack/identity/v3/_proxy.py
+++ b/openstack/identity/v3/_proxy.py
@@ -939,6 +939,18 @@ class Proxy(proxy.Proxy):
         """
         return self._get(_user.User, user)
 
+    def user_groups(self, user):
+        """List groups a user is in
+
+        :param user: Either the ID of a user or a
+            :class:`~openstack.identity.v3.user.User` instance
+
+        :return: List of :class:`~openstack.identity.v3.group.group`
+        """
+        user_id = self._get_resource(_user.User, user).id
+        groups = self._list(_group.UserGroup, user_id=user_id)
+        return groups
+
     def users(self, **query):
         """Retrieve a generator of users
 
diff --git a/openstack/identity/v3/group.py b/openstack/identity/v3/group.py
index c1c11d9a7..d795f96f5 100644
--- a/openstack/identity/v3/group.py
+++ b/openstack/identity/v3/group.py
@@ -74,3 +74,17 @@ class Group(resource.Resource):
         if resp.status_code == 204:
             return True
         return False
+
+
+class UserGroup(Group):
+    base_path = '/users/%(user_id)%/groups'
+
+    #: The ID for the user from the URI of the resource
+    user_id = resource.URI('user_id')
+
+    # capabilities
+    allow_create = False
+    allow_fetch = False
+    allow_commit = False
+    allow_delete = False
+    allow_list = True
diff --git a/openstack/tests/unit/identity/v3/test_proxy.py b/openstack/tests/unit/identity/v3/test_proxy.py
index faaa3a5e6..13b930b77 100644
--- a/openstack/tests/unit/identity/v3/test_proxy.py
+++ b/openstack/tests/unit/identity/v3/test_proxy.py
@@ -385,6 +385,14 @@ class TestIdentityProxyUser(TestIdentityProxyBase):
     def test_user_update(self):
         self.verify_update(self.proxy.update_user, user.User)
 
+    def test_user_groups(self):
+        self.verify_list(
+            self.proxy.user_groups,
+            group.UserGroup,
+            method_kwargs={"user": 'user'},
+            expected_kwargs={"user_id": "user"},
+        )
+
 
 class TestIdentityProxyTrust(TestIdentityProxyBase):
     def test_trust_create_attrs(self):