diff --git a/releasenotes/notes/list-auth-domains-v3-endpoint-9ec60c7d3011c397.yaml b/releasenotes/notes/list-auth-domains-v3-endpoint-9ec60c7d3011c397.yaml
new file mode 100644
index 0000000..0f104cf
--- /dev/null
+++ b/releasenotes/notes/list-auth-domains-v3-endpoint-9ec60c7d3011c397.yaml
@@ -0,0 +1,6 @@
+---
+features:
+  - |
+    Add ``list_auth_domains`` API endpoint to the identity v3 client. This
+    allows the possibility of listing all domains a user has access to
+    via role assignments.
diff --git a/tempest/api/identity/admin/v3/test_tokens.py b/tempest/api/identity/admin/v3/test_tokens.py
index 6343ea8..0845407 100644
--- a/tempest/api/identity/admin/v3/test_tokens.py
+++ b/tempest/api/identity/admin/v3/test_tokens.py
@@ -26,6 +26,8 @@
 
 class TokensV3TestJSON(base.BaseIdentityV3AdminTest):
 
+    credentials = ['primary', 'admin', 'alt']
+
     @decorators.idempotent_id('0f9f5a5f-d5cd-4a86-8a5b-c5ded151f212')
     def test_tokens(self):
         # Valid user's token is authenticated
@@ -163,12 +165,78 @@
         # Get available project scopes
         available_projects = self.client.list_auth_projects()['projects']
 
-        # create list to save fetched project's id
+        # Create list to save fetched project IDs
         fetched_project_ids = [i['id'] for i in available_projects]
 
         # verifying the project ids in list
         missing_project_ids = \
             [p for p in assigned_project_ids if p not in fetched_project_ids]
         self.assertEmpty(missing_project_ids,
-                         "Failed to find project_id %s in fetched list" %
+                         "Failed to find project_ids %s in fetched list" %
                          ', '.join(missing_project_ids))
+
+    @decorators.idempotent_id('ec5ecb05-af64-4c04-ac86-4d9f6f12f185')
+    def test_get_available_domain_scopes(self):
+        # Test for verifying that listing domain scopes for a user works if
+        # the user has a domain role or belongs to a group that has a domain
+        # role. For this test, admin client is used to add roles to alt user,
+        # which performs API calls, to avoid 401 Unauthorized errors.
+        alt_user_id = self.os_alt.credentials.user_id
+
+        def _create_user_domain_role_for_alt_user():
+            domain_id = self.setup_test_domain()['id']
+            role_id = self.setup_test_role()['id']
+
+            # Create a role association between the user and domain.
+            self.roles_client.create_user_role_on_domain(
+                domain_id, alt_user_id, role_id)
+            self.addCleanup(
+                self.roles_client.delete_role_from_user_on_domain,
+                domain_id, alt_user_id, role_id)
+
+            return domain_id
+
+        def _create_group_domain_role_for_alt_user():
+            domain_id = self.setup_test_domain()['id']
+            role_id = self.setup_test_role()['id']
+
+            # Create a group.
+            group_name = data_utils.rand_name('Group')
+            group_id = self.groups_client.create_group(
+                name=group_name, domain_id=domain_id)['group']['id']
+            self.addCleanup(self.groups_client.delete_group, group_id)
+
+            # Add the alt user to the group.
+            self.groups_client.add_group_user(group_id, alt_user_id)
+            self.addCleanup(self.groups_client.delete_group_user,
+                            group_id, alt_user_id)
+
+            # Create a role association between the group and domain.
+            self.roles_client.create_group_role_on_domain(
+                domain_id, group_id, role_id)
+            self.addCleanup(
+                self.roles_client.delete_role_from_group_on_domain,
+                domain_id, group_id, role_id)
+
+            return domain_id
+
+        # Add the alt user to 2 random domains and 2 random groups
+        # with randomized domains and roles.
+        assigned_domain_ids = []
+        for _ in range(2):
+            domain_id = _create_user_domain_role_for_alt_user()
+            assigned_domain_ids.append(domain_id)
+            domain_id = _create_group_domain_role_for_alt_user()
+            assigned_domain_ids.append(domain_id)
+
+        # Get available domain scopes for the alt user.
+        available_domains = self.os_alt.identity_v3_client.list_auth_domains()[
+            'domains']
+        fetched_domain_ids = [i['id'] for i in available_domains]
+
+        # Verify the expected domain IDs are in the list.
+        missing_domain_ids = \
+            [p for p in assigned_domain_ids if p not in fetched_domain_ids]
+        self.assertEmpty(missing_domain_ids,
+                         "Failed to find domain_ids %s in fetched list"
+                         % ", ".join(missing_domain_ids))
diff --git a/tempest/api/network/test_routers.py b/tempest/api/network/test_routers.py
index 99ffaa8..abbb779 100644
--- a/tempest/api/network/test_routers.py
+++ b/tempest/api/network/test_routers.py
@@ -65,9 +65,12 @@
                           'The public_network_id option must be specified.')
     def test_create_show_list_update_delete_router(self):
         # Create a router
+        name = data_utils.rand_name(self.__class__.__name__ + '-router')
         router = self._create_router(
+            name=name,
             admin_state_up=False,
             external_network_id=CONF.network.public_network_id)
+        self.assertEqual(router['name'], name)
         self.assertEqual(router['admin_state_up'], False)
         self.assertEqual(
             router['external_gateway_info']['network_id'],
diff --git a/tempest/lib/services/identity/v3/identity_client.py b/tempest/lib/services/identity/v3/identity_client.py
index 2512a3e..ad770bf 100644
--- a/tempest/lib/services/identity/v3/identity_client.py
+++ b/tempest/lib/services/identity/v3/identity_client.py
@@ -57,3 +57,10 @@
         self.expected_success(200, resp.status)
         body = json.loads(body)
         return rest_client.ResponseBody(resp, body)
+
+    def list_auth_domains(self):
+        """Get available domain scopes."""
+        resp, body = self.get("auth/domains")
+        self.expected_success(200, resp.status)
+        body = json.loads(body)
+        return rest_client.ResponseBody(resp, body)
diff --git a/tempest/scenario/manager.py b/tempest/scenario/manager.py
index c34eddb..6a12b59 100644
--- a/tempest/scenario/manager.py
+++ b/tempest/scenario/manager.py
@@ -706,17 +706,14 @@
                         network['id'])
         return network
 
-    def _create_subnet(self, network, subnets_client=None,
-                       routers_client=None, namestart='subnet-smoke',
-                       **kwargs):
+    def create_subnet(self, network, subnets_client=None,
+                      namestart='subnet-smoke', **kwargs):
         """Create a subnet for the given network
 
         within the cidr block configured for tenant networks.
         """
         if not subnets_client:
             subnets_client = self.subnets_client
-        if not routers_client:
-            routers_client = self.routers_client
 
         def cidr_in_use(cidr, tenant_id):
             """Check cidr existence
@@ -1087,31 +1084,18 @@
             body = client.show_router(router_id)
             return body['router']
         elif network_id:
-            router = self._create_router(client, tenant_id)
-            kwargs = {'external_gateway_info': dict(network_id=network_id)}
-            router = client.update_router(router['id'], **kwargs)['router']
+            router = client.create_router(
+                name=data_utils.rand_name(self.__class__.__name__ + '-router'),
+                admin_state_up=True,
+                tenant_id=tenant_id,
+                external_gateway_info=dict(network_id=network_id))['router']
+            self.addCleanup(test_utils.call_and_ignore_notfound_exc,
+                            client.delete_router, router['id'])
             return router
         else:
             raise Exception("Neither of 'public_router_id' or "
                             "'public_network_id' has been defined.")
 
-    def _create_router(self, client=None, tenant_id=None,
-                       namestart='router-smoke'):
-        if not client:
-            client = self.routers_client
-        if not tenant_id:
-            tenant_id = client.tenant_id
-        name = data_utils.rand_name(namestart)
-        result = client.create_router(name=name,
-                                      admin_state_up=True,
-                                      tenant_id=tenant_id)
-        router = result['router']
-        self.assertEqual(router['name'], name)
-        self.addCleanup(test_utils.call_and_ignore_notfound_exc,
-                        client.delete_router,
-                        router['id'])
-        return router
-
     def create_networks(self, networks_client=None,
                         routers_client=None, subnets_client=None,
                         tenant_id=None, dns_nameservers=None,
@@ -1146,12 +1130,11 @@
             router = self._get_router(client=routers_client,
                                       tenant_id=tenant_id)
             subnet_kwargs = dict(network=network,
-                                 subnets_client=subnets_client,
-                                 routers_client=routers_client)
+                                 subnets_client=subnets_client)
             # use explicit check because empty list is a valid option
             if dns_nameservers is not None:
                 subnet_kwargs['dns_nameservers'] = dns_nameservers
-            subnet = self._create_subnet(**subnet_kwargs)
+            subnet = self.create_subnet(**subnet_kwargs)
             if not routers_client:
                 routers_client = self.routers_client
             router_id = router['id']
diff --git a/tempest/scenario/test_network_basic_ops.py b/tempest/scenario/test_network_basic_ops.py
index 8937104..6332c6d 100644
--- a/tempest/scenario/test_network_basic_ops.py
+++ b/tempest/scenario/test_network_basic_ops.py
@@ -227,10 +227,10 @@
     def _create_new_network(self, create_gateway=False):
         self.new_net = self._create_network()
         if create_gateway:
-            self.new_subnet = self._create_subnet(
+            self.new_subnet = self.create_subnet(
                 network=self.new_net)
         else:
-            self.new_subnet = self._create_subnet(
+            self.new_subnet = self.create_subnet(
                 network=self.new_net,
                 gateway_ip=None)
 
diff --git a/tempest/scenario/test_network_v6.py b/tempest/scenario/test_network_v6.py
index b687aa0..210f0ba 100644
--- a/tempest/scenario/test_network_v6.py
+++ b/tempest/scenario/test_network_v6.py
@@ -78,9 +78,9 @@
         if dualnet:
             network_v6 = self._create_network()
 
-        sub4 = self._create_subnet(network=network,
-                                   namestart='sub4',
-                                   ip_version=4)
+        sub4 = self.create_subnet(network=network,
+                                  namestart='sub4',
+                                  ip_version=4)
 
         router = self._get_router()
         self.routers_client.add_router_interface(router['id'],
@@ -93,11 +93,11 @@
         self.subnets_v6 = []
         for _ in range(n_subnets6):
             net6 = network_v6 if dualnet else network
-            sub6 = self._create_subnet(network=net6,
-                                       namestart='sub6',
-                                       ip_version=6,
-                                       ipv6_ra_mode=address6_mode,
-                                       ipv6_address_mode=address6_mode)
+            sub6 = self.create_subnet(network=net6,
+                                      namestart='sub6',
+                                      ip_version=6,
+                                      ipv6_ra_mode=address6_mode,
+                                      ipv6_address_mode=address6_mode)
 
             self.routers_client.add_router_interface(router['id'],
                                                      subnet_id=sub6['id'])
diff --git a/tempest/tests/lib/services/identity/v3/test_identity_client.py b/tempest/tests/lib/services/identity/v3/test_identity_client.py
index 6572947..3739fe6 100644
--- a/tempest/tests/lib/services/identity/v3/test_identity_client.py
+++ b/tempest/tests/lib/services/identity/v3/test_identity_client.py
@@ -60,6 +60,34 @@
         }
     }
 
+    FAKE_AUTH_DOMAINS = {
+        "domains": [
+            {
+                "description": "my domain description",
+                "enabled": True,
+                "id": "1789d1",
+                "links": {
+                    "self": "https://example.com/identity/v3/domains/1789d1"
+                },
+                "name": "my domain"
+            },
+            {
+                "description": "description of my other domain",
+                "enabled": True,
+                "id": "43e8da",
+                "links": {
+                    "self": "https://example.com/identity/v3/domains/43e8da"
+                },
+                "name": "another domain"
+            }
+        ],
+        "links": {
+            "self": "https://example.com/identity/v3/auth/domains",
+            "previous": None,
+            "next": None
+        }
+    }
+
     def setUp(self):
         super(TestIdentityClient, self).setUp()
         fake_auth = fake_auth_provider.FakeAuthProvider()
@@ -89,6 +117,13 @@
             self.FAKE_AUTH_PROJECTS,
             bytes_body)
 
+    def _test_list_auth_domains(self, bytes_body=False):
+        self.check_service_client_function(
+            self.client.list_auth_domains,
+            'tempest.lib.common.rest_client.RestClient.get',
+            self.FAKE_AUTH_DOMAINS,
+            bytes_body)
+
     def test_show_api_description_with_str_body(self):
         self._test_show_api_description()
 
@@ -122,3 +157,9 @@
 
     def test_list_auth_projects_with_bytes_body(self):
         self._test_list_auth_projects(bytes_body=True)
+
+    def test_list_auth_domains_with_str_body(self):
+        self._test_list_auth_domains()
+
+    def test_list_auth_domains_with_bytes_body(self):
+        self._test_list_auth_domains(bytes_body=True)