diff --git a/keystoneclient/tests/unit/v3/test_role_assignments.py b/keystoneclient/tests/unit/v3/test_role_assignments.py
index 1a664c966..79d2585df 100644
--- a/keystoneclient/tests/unit/v3/test_role_assignments.py
+++ b/keystoneclient/tests/unit/v3/test_role_assignments.py
@@ -177,6 +177,21 @@ class RoleAssignmentsTests(utils.TestCase, utils.CrudTests):
         kwargs = {'role.id': self.TEST_ROLE_ID}
         self.assertQueryStringContains(**kwargs)
 
+    def test_role_assignments_inherited_list(self):
+        ref_list = self.TEST_ALL_RESPONSE_LIST
+        self.stub_entity('GET',
+                         [self.collection_key,
+                          '?scope.OS-INHERIT:inherited_to=projects'],
+                         entity=ref_list
+                         )
+
+        returned_list = self.manager.list(
+            os_inherit_extension_inherited_to='projects')
+        self._assert_returned_list(ref_list, returned_list)
+
+        query_string = 'scope.OS-INHERIT:inherited_to=projects'
+        self.assertQueryStringIs(query_string)
+
     def test_domain_and_project_list(self):
         # Should only accept either domain or project, never both
         self.assertRaises(exceptions.ValidationError,
diff --git a/keystoneclient/v3/role_assignments.py b/keystoneclient/v3/role_assignments.py
index 6518e4392..d71f9eb11 100644
--- a/keystoneclient/v3/role_assignments.py
+++ b/keystoneclient/v3/role_assignments.py
@@ -47,7 +47,7 @@ class RoleAssignmentManager(base.CrudManager):
             raise exceptions.ValidationError(msg)
 
     def list(self, user=None, group=None, project=None, domain=None, role=None,
-             effective=False):
+             effective=False, os_inherit_extension_inherited_to=None):
         """Lists role assignments.
 
         If no arguments are provided, all role assignments in the
@@ -66,6 +66,9 @@ class RoleAssignmentManager(base.CrudManager):
         :param role: Role to be used as query filter. (optional)
         :param boolean effective: return effective role
                                   assignments. (optional)
+        :param string os_inherit_extension_inherited_to:
+            return inherited role assignments for either 'projects' or
+            'domains'. (optional)
         """
 
         self._check_not_user_and_group(user, group)
@@ -84,6 +87,9 @@ class RoleAssignmentManager(base.CrudManager):
             query_params['role.id'] = base.getid(role)
         if effective:
             query_params['effective'] = effective
+        if os_inherit_extension_inherited_to:
+            query_params['scope.OS-INHERIT:inherited_to'] = (
+                os_inherit_extension_inherited_to)
 
         return super(RoleAssignmentManager, self).list(**query_params)