diff --git a/openstackclient/identity/v3/group.py b/openstackclient/identity/v3/group.py
index c5a4401722..4eb144896d 100644
--- a/openstackclient/identity/v3/group.py
+++ b/openstackclient/identity/v3/group.py
@@ -164,17 +164,21 @@ class DeleteGroup(command.Command):
 
 
 class ListGroup(lister.Lister):
-    """List groups and optionally roles assigned to groups"""
+    """List groups"""
 
     log = logging.getLogger(__name__ + '.ListGroup')
 
     def get_parser(self, prog_name):
         parser = super(ListGroup, self).get_parser(prog_name)
         parser.add_argument(
-            'group',
-            metavar='<group>',
-            nargs='?',
-            help='Name or ID of group to list [required with --role]',
+            '--domain',
+            metavar='<domain>',
+            help='Filter group list by <domain>',
+        )
+        parser.add_argument(
+            '--user',
+            metavar='<user>',
+            help='List group memberships for <user> (name or ID)',
         )
         parser.add_argument(
             '--long',
@@ -188,18 +192,39 @@ class ListGroup(lister.Lister):
         self.log.debug('take_action(%s)', parsed_args)
         identity_client = self.app.client_manager.identity
 
+        if parsed_args.domain:
+            domain = utils.find_resource(
+                identity_client.domains,
+                parsed_args.domain,
+            ).id
+        else:
+            domain = None
+
+        if parsed_args.user:
+            user = utils.find_resource(
+                identity_client.users,
+                parsed_args.user,
+            ).id
+        else:
+            user = None
+
         # List groups
         if parsed_args.long:
             columns = ('ID', 'Name', 'Domain ID', 'Description')
         else:
             columns = ('ID', 'Name')
-        data = identity_client.groups.list()
+        data = identity_client.groups.list(
+            domain=domain,
+            user=user,
+        )
 
-        return (columns,
-                (utils.get_item_properties(
-                    s, columns,
-                    formatters={},
-                ) for s in data))
+        return (
+            columns,
+            (utils.get_item_properties(
+                s, columns,
+                formatters={},
+            ) for s in data)
+        )
 
 
 class RemoveUserFromGroup(command.Command):
diff --git a/openstackclient/identity/v3/user.py b/openstackclient/identity/v3/user.py
index c4adb225ca..38c3497339 100644
--- a/openstackclient/identity/v3/user.py
+++ b/openstackclient/identity/v3/user.py
@@ -148,17 +148,21 @@ class DeleteUser(command.Command):
 
 
 class ListUser(lister.Lister):
-    """List users and optionally roles assigned to users"""
+    """List users"""
 
     log = logging.getLogger(__name__ + '.ListUser')
 
     def get_parser(self, prog_name):
         parser = super(ListUser, self).get_parser(prog_name)
         parser.add_argument(
-            'user',
-            metavar='<user>',
-            nargs='?',
-            help='Name or ID of user to list [required with --role]',
+            '--domain',
+            metavar='<domain>',
+            help='Filter group list by <domain>',
+        )
+        parser.add_argument(
+            '--group',
+            metavar='<group>',
+            help='List memberships of <group> (name or ID)',
         )
         parser.add_argument(
             '--long',
@@ -169,7 +173,24 @@ class ListUser(lister.Lister):
         return parser
 
     def take_action(self, parsed_args):
-        self.log.debug('take_action(%s)' % parsed_args)
+        self.log.debug('take_action(%s)', parsed_args)
+        identity_client = self.app.client_manager.identity
+
+        if parsed_args.domain:
+            domain = utils.find_resource(
+                identity_client.domains,
+                parsed_args.domain,
+            ).id
+        else:
+            domain = None
+
+        if parsed_args.group:
+            group = utils.find_resource(
+                identity_client.groups,
+                parsed_args.group,
+            ).id
+        else:
+            group = None
 
         # List users
         if parsed_args.long:
@@ -177,13 +198,18 @@ class ListUser(lister.Lister):
                        'Description', 'Email', 'Enabled')
         else:
             columns = ('ID', 'Name')
-        data = self.app.client_manager.identity.users.list()
+        data = identity_client.users.list(
+            domain=domain,
+            group=group,
+        )
 
-        return (columns,
-                (utils.get_item_properties(
-                    s, columns,
-                    formatters={},
-                ) for s in data))
+        return (
+            columns,
+            (utils.get_item_properties(
+                s, columns,
+                formatters={},
+            ) for s in data)
+        )
 
 
 class SetUser(command.Command):
diff --git a/openstackclient/tests/identity/v3/test_group.py b/openstackclient/tests/identity/v3/test_group.py
new file mode 100644
index 0000000000..dce5636281
--- /dev/null
+++ b/openstackclient/tests/identity/v3/test_group.py
@@ -0,0 +1,193 @@
+#   Licensed under the Apache License, Version 2.0 (the "License"); you may
+#   not use this file except in compliance with the License. You may obtain
+#   a copy of the License at
+#
+#        http://www.apache.org/licenses/LICENSE-2.0
+#
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#   WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#   License for the specific language governing permissions and limitations
+#   under the License.
+#
+
+import copy
+
+from openstackclient.identity.v3 import group
+from openstackclient.tests import fakes
+from openstackclient.tests.identity.v3 import fakes as identity_fakes
+
+
+class TestGroup(identity_fakes.TestIdentityv3):
+
+    def setUp(self):
+        super(TestGroup, self).setUp()
+
+        # Get a shortcut to the DomainManager Mock
+        self.domains_mock = self.app.client_manager.identity.domains
+        self.domains_mock.reset_mock()
+
+        # Get a shortcut to the GroupManager Mock
+        self.groups_mock = self.app.client_manager.identity.groups
+        self.groups_mock.reset_mock()
+
+        # Get a shortcut to the UserManager Mock
+        self.users_mock = self.app.client_manager.identity.users
+        self.users_mock.reset_mock()
+
+
+class TestGroupList(TestGroup):
+
+    def setUp(self):
+        super(TestGroupList, self).setUp()
+
+        self.groups_mock.get.return_value = fakes.FakeResource(
+            None,
+            copy.deepcopy(identity_fakes.GROUP),
+            loaded=True,
+        )
+        self.groups_mock.list.return_value = [
+            fakes.FakeResource(
+                None,
+                copy.deepcopy(identity_fakes.GROUP),
+                loaded=True,
+            ),
+        ]
+
+        self.domains_mock.get.return_value = fakes.FakeResource(
+            None,
+            copy.deepcopy(identity_fakes.DOMAIN),
+            loaded=True,
+        )
+
+        self.users_mock.get.return_value = fakes.FakeResource(
+            None,
+            copy.deepcopy(identity_fakes.USER),
+            loaded=True,
+        )
+
+        # Get the command object to test
+        self.cmd = group.ListGroup(self.app, None)
+
+    def test_group_list_no_options(self):
+        arglist = []
+        verifylist = []
+        parsed_args = self.check_parser(self.cmd, arglist, verifylist)
+
+        # DisplayCommandBase.take_action() returns two tuples
+        columns, data = self.cmd.take_action(parsed_args)
+
+        # Set expected values
+        kwargs = {
+            'domain': None,
+            'user': None,
+        }
+
+        self.groups_mock.list.assert_called_with(
+            **kwargs
+        )
+
+        collist = ('ID', 'Name')
+        self.assertEqual(columns, collist)
+        datalist = ((
+            identity_fakes.group_id,
+            identity_fakes.group_name,
+        ), )
+        self.assertEqual(datalist, tuple(data))
+
+    def test_group_list_domain(self):
+        arglist = [
+            '--domain', identity_fakes.domain_id,
+        ]
+        verifylist = [
+            ('domain', identity_fakes.domain_id),
+        ]
+        parsed_args = self.check_parser(self.cmd, arglist, verifylist)
+
+        # DisplayCommandBase.take_action() returns two tuples
+        columns, data = self.cmd.take_action(parsed_args)
+
+        # Set expected values
+        kwargs = {
+            'domain': identity_fakes.domain_id,
+            'user': None,
+        }
+
+        self.groups_mock.list.assert_called_with(
+            **kwargs
+        )
+
+        collist = ('ID', 'Name')
+        self.assertEqual(columns, collist)
+        datalist = ((
+            identity_fakes.group_id,
+            identity_fakes.group_name,
+        ), )
+        self.assertEqual(datalist, tuple(data))
+
+    def test_group_list_user(self):
+        arglist = [
+            '--user', identity_fakes.user_name,
+        ]
+        verifylist = [
+            ('user', identity_fakes.user_name),
+        ]
+        parsed_args = self.check_parser(self.cmd, arglist, verifylist)
+
+        # DisplayCommandBase.take_action() returns two tuples
+        columns, data = self.cmd.take_action(parsed_args)
+
+        # Set expected values
+        kwargs = {
+            'domain': None,
+            'user': identity_fakes.user_id,
+        }
+
+        self.groups_mock.list.assert_called_with(
+            **kwargs
+        )
+
+        collist = ('ID', 'Name')
+        self.assertEqual(columns, collist)
+        datalist = ((
+            identity_fakes.group_id,
+            identity_fakes.group_name,
+        ), )
+        self.assertEqual(datalist, tuple(data))
+
+    def test_group_list_long(self):
+        arglist = [
+            '--long',
+        ]
+        verifylist = [
+            ('long', True),
+        ]
+        parsed_args = self.check_parser(self.cmd, arglist, verifylist)
+
+        # DisplayCommandBase.take_action() returns two tuples
+        columns, data = self.cmd.take_action(parsed_args)
+
+        # Set expected values
+        kwargs = {
+            'domain': None,
+            'user': None,
+        }
+
+        self.groups_mock.list.assert_called_with(
+            **kwargs
+        )
+
+        collist = (
+            'ID',
+            'Name',
+            'Domain ID',
+            'Description',
+        )
+        self.assertEqual(columns, collist)
+        datalist = ((
+            identity_fakes.group_id,
+            identity_fakes.group_name,
+            '',
+            '',
+        ), )
+        self.assertEqual(datalist, tuple(data))
diff --git a/openstackclient/tests/identity/v3/test_user.py b/openstackclient/tests/identity/v3/test_user.py
index b9c060d767..569d91401c 100644
--- a/openstackclient/tests/identity/v3/test_user.py
+++ b/openstackclient/tests/identity/v3/test_user.py
@@ -34,9 +34,9 @@ class TestUser(identity_fakes.TestIdentityv3):
         self.projects_mock = self.app.client_manager.identity.projects
         self.projects_mock.reset_mock()
 
-        # Get a shortcut to the RoleManager Mock
-        self.roles_mock = self.app.client_manager.identity.roles
-        self.roles_mock.reset_mock()
+        # Get a shortcut to the GroupManager Mock
+        self.groups_mock = self.app.client_manager.identity.groups
+        self.groups_mock.reset_mock()
 
         # Get a shortcut to the UserManager Mock
         self.users_mock = self.app.client_manager.identity.users
@@ -489,6 +489,18 @@ class TestUserList(TestUser):
             ),
         ]
 
+        self.domains_mock.get.return_value = fakes.FakeResource(
+            None,
+            copy.deepcopy(identity_fakes.DOMAIN),
+            loaded=True,
+        )
+
+        self.groups_mock.get.return_value = fakes.FakeResource(
+            None,
+            copy.deepcopy(identity_fakes.GROUP),
+            loaded=True,
+        )
+
         # Get the command object to test
         self.cmd = user.ListUser(self.app, None)
 
@@ -500,7 +512,15 @@ class TestUserList(TestUser):
         # DisplayCommandBase.take_action() returns two tuples
         columns, data = self.cmd.take_action(parsed_args)
 
-        self.users_mock.list.assert_called_with()
+        # Set expected values
+        kwargs = {
+            'domain': None,
+            'group': None,
+        }
+
+        self.users_mock.list.assert_called_with(
+            **kwargs
+        )
 
         collist = ('ID', 'Name')
         self.assertEqual(columns, collist)
@@ -508,7 +528,67 @@ class TestUserList(TestUser):
             identity_fakes.user_id,
             identity_fakes.user_name,
         ), )
-        self.assertEqual(tuple(data), datalist)
+        self.assertEqual(datalist, tuple(data))
+
+    def test_user_list_domain(self):
+        arglist = [
+            '--domain', identity_fakes.domain_id,
+        ]
+        verifylist = [
+            ('domain', identity_fakes.domain_id),
+        ]
+        parsed_args = self.check_parser(self.cmd, arglist, verifylist)
+
+        # DisplayCommandBase.take_action() returns two tuples
+        columns, data = self.cmd.take_action(parsed_args)
+
+        # Set expected values
+        kwargs = {
+            'domain': identity_fakes.domain_id,
+            'group': None,
+        }
+
+        self.users_mock.list.assert_called_with(
+            **kwargs
+        )
+
+        collist = ('ID', 'Name')
+        self.assertEqual(columns, collist)
+        datalist = ((
+            identity_fakes.user_id,
+            identity_fakes.user_name,
+        ), )
+        self.assertEqual(datalist, tuple(data))
+
+    def test_user_list_group(self):
+        arglist = [
+            '--group', identity_fakes.group_name,
+        ]
+        verifylist = [
+            ('group', identity_fakes.group_name),
+        ]
+        parsed_args = self.check_parser(self.cmd, arglist, verifylist)
+
+        # DisplayCommandBase.take_action() returns two tuples
+        columns, data = self.cmd.take_action(parsed_args)
+
+        # Set expected values
+        kwargs = {
+            'domain': None,
+            'group': identity_fakes.group_id,
+        }
+
+        self.users_mock.list.assert_called_with(
+            **kwargs
+        )
+
+        collist = ('ID', 'Name')
+        self.assertEqual(columns, collist)
+        datalist = ((
+            identity_fakes.user_id,
+            identity_fakes.user_name,
+        ), )
+        self.assertEqual(datalist, tuple(data))
 
     def test_user_list_long(self):
         arglist = [
@@ -522,7 +602,15 @@ class TestUserList(TestUser):
         # DisplayCommandBase.take_action() returns two tuples
         columns, data = self.cmd.take_action(parsed_args)
 
-        self.users_mock.list.assert_called_with()
+        # Set expected values
+        kwargs = {
+            'domain': None,
+            'group': None,
+        }
+
+        self.users_mock.list.assert_called_with(
+            **kwargs
+        )
 
         collist = (
             'ID',
@@ -543,7 +631,7 @@ class TestUserList(TestUser):
             identity_fakes.user_email,
             True,
         ), )
-        self.assertEqual(tuple(data), datalist)
+        self.assertEqual(datalist, tuple(data))
 
 
 class TestUserSet(TestUser):