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/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/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)