diff --git a/releasenotes/notes/add-additional-methods-to-roles-client-library-178d4a6000dec72d.yaml b/releasenotes/notes/add-additional-methods-to-roles-client-library-178d4a6000dec72d.yaml
new file mode 100644
index 0000000..01136c6
--- /dev/null
+++ b/releasenotes/notes/add-additional-methods-to-roles-client-library-178d4a6000dec72d.yaml
@@ -0,0 +1,7 @@
+---
+features:
+  - |
+    Add missing API call, list all role inference rules,
+    to the roles_client library. This feature enables the
+    possibility of listing all role inference rules in the
+    system.
diff --git a/tempest/api/identity/admin/v3/test_roles.py b/tempest/api/identity/admin/v3/test_roles.py
index e07d525..04be00b 100644
--- a/tempest/api/identity/admin/v3/test_roles.py
+++ b/tempest/api/identity/admin/v3/test_roles.py
@@ -381,3 +381,48 @@
         role_assignments = self.role_assignments.list_role_assignments(
             effective=True, **params)['role_assignments']
         self.assertEmpty(role_assignments)
+
+    @decorators.idempotent_id('3748c316-c18f-4b08-997b-c60567bc6235')
+    def test_list_all_implied_roles(self):
+        # Create inference rule from "roles[0]" to "roles[1]"
+        self._create_implied_role(
+            self.roles[0]['id'], self.roles[1]['id'])
+
+        # Create inference rule from "roles[0]" to "roles[2]"
+        self._create_implied_role(
+            self.roles[0]['id'], self.roles[2]['id'])
+
+        # Create inference rule from "roles[2]" to "role"
+        self._create_implied_role(
+            self.roles[2]['id'], self.role['id'])
+
+        rules = self.roles_client.list_all_role_inference_rules()[
+            'role_inferences']
+        # Sort the rules by the number of inferences, since there should be 1
+        # inference between "roles[2]" and "role" and 2 inferences for
+        # "roles[0]": between "roles[1]" and "roles[2]".
+        sorted_rules = sorted(rules, key=lambda r: len(r['implies']))
+
+        # Check that 2 sets of rules are returned.
+        self.assertEqual(2, len(sorted_rules))
+        # Check that only 1 inference rule exists between "roles[2]" and "role"
+        self.assertEqual(1, len(sorted_rules[0]['implies']))
+        # Check that 2 inference rules exist for "roles[0]": one between
+        # "roles[1]" and one between "roles[2]".
+        self.assertEqual(2, len(sorted_rules[1]['implies']))
+
+        # Check that "roles[2]" is the "prior_role" and that "role" is the
+        # "implies" role.
+        self.assertEqual(self.roles[2]['id'],
+                         sorted_rules[0]['prior_role']['id'])
+        self.assertEqual(self.role['id'],
+                         sorted_rules[0]['implies'][0]['id'])
+
+        # Check that "roles[0]" is the "prior_role" and that "roles[1]" and
+        # "roles[2]" are the "implies" roles.
+        self.assertEqual(self.roles[0]['id'],
+                         sorted_rules[1]['prior_role']['id'])
+
+        implies_ids = [r['id'] for r in sorted_rules[1]['implies']]
+        self.assertIn(self.roles[1]['id'], implies_ids)
+        self.assertIn(self.roles[2]['id'], implies_ids)
diff --git a/tempest/lib/services/identity/v3/roles_client.py b/tempest/lib/services/identity/v3/roles_client.py
index 0df23ce..43e3c01 100644
--- a/tempest/lib/services/identity/v3/roles_client.py
+++ b/tempest/lib/services/identity/v3/roles_client.py
@@ -214,6 +214,18 @@
         body = json.loads(body)
         return rest_client.ResponseBody(resp, body)
 
+    def list_all_role_inference_rules(self):
+        """Lists all role inference rules.
+
+        For a full list of available parameters, please refer to the official
+        API reference:
+        http://developer.openstack.org/api-ref/identity/v3/index.html#list-all-role-inference-rules
+        """
+        resp, body = self.get('role_inferences')
+        self.expected_success(200, resp.status)
+        body = json.loads(body)
+        return rest_client.ResponseBody(resp, body)
+
     def check_role_inference_rule(self, prior_role, implies_role):
         """Check a role inference rule."""
         resp, body = self.head('roles/%s/implies/%s' %
diff --git a/tempest/tests/lib/services/identity/v3/test_roles_client.py b/tempest/tests/lib/services/identity/v3/test_roles_client.py
index 41cea85..8d6bb42 100644
--- a/tempest/tests/lib/services/identity/v3/test_roles_client.py
+++ b/tempest/tests/lib/services/identity/v3/test_roles_client.py
@@ -26,6 +26,18 @@
     FAKE_ROLE_ID_2 = "2"
     FAKE_ROLE_NAME_2 = "test2"
 
+    FAKE_ROLE_ID_3 = "3"
+    FAKE_ROLE_NAME_3 = "test3"
+
+    FAKE_ROLE_ID_4 = "4"
+    FAKE_ROLE_NAME_4 = "test4"
+
+    FAKE_ROLE_ID_5 = "5"
+    FAKE_ROLE_NAME_5 = "test5"
+
+    FAKE_ROLE_ID_6 = "6"
+    FAKE_ROLE_NAME_6 = "test6"
+
     FAKE_ROLE_INFO = {
         "role": {
             "domain_id": FAKE_DOMAIN_ID,
@@ -77,8 +89,8 @@
         }
     }
 
-    FAKE_LIST_ROLE_INFERENCES_RULES = {
-        "role_inference": {
+    COMMON_FAKE_LIST_ROLE_INFERENCE_RULES = [
+        {
             "prior_role": {
                 "id": FAKE_ROLE_ID,
                 "name": FAKE_ROLE_NAME,
@@ -97,20 +109,60 @@
                     }
                 },
                 {
-                    "id": "3",
-                    "name": "test3",
+                    "id": FAKE_ROLE_ID_3,
+                    "name": FAKE_ROLE_NAME_3,
                     "links": {
-                        "self": "http://example.com/identity/v3/roles/3"
+                        "self": "http://example.com/identity/v3/roles/%s" % (
+                            FAKE_ROLE_ID_3)
                     }
                 }
             ]
         },
+        {
+            "prior_role": {
+                "id": FAKE_ROLE_ID_4,
+                "name": FAKE_ROLE_NAME_4,
+                "links": {
+                    "self": "http://example.com/identity/v3/roles/%s" % (
+                        FAKE_ROLE_ID_4)
+                }
+            },
+            "implies": [
+                {
+                    "id": FAKE_ROLE_ID_5,
+                    "name": FAKE_ROLE_NAME_5,
+                    "links": {
+                        "self": "http://example.com/identity/v3/roles/%s" % (
+                            FAKE_ROLE_ID_5)
+                    }
+                },
+                {
+                    "id": FAKE_ROLE_ID_6,
+                    "name": FAKE_ROLE_NAME_6,
+                    "links": {
+                        "self": "http://example.com/identity/v3/roles/%s" % (
+                            FAKE_ROLE_ID_6)
+                    }
+                }
+            ]
+        }
+    ]
+
+    FAKE_LIST_ROLE_INFERENCE_RULES = {
+        "role_inference": COMMON_FAKE_LIST_ROLE_INFERENCE_RULES[0],
         "links": {
             "self": "http://example.com/identity/v3/roles/"
                     "%s/implies" % FAKE_ROLE_ID
         }
     }
 
+    FAKE_LIST_ALL_ROLE_INFERENCE_RULES = {
+        "role_inferences": COMMON_FAKE_LIST_ROLE_INFERENCE_RULES,
+        "links": {
+            "self": "http://example.com/identity/v3/role_inferences"
+        }
+    }
+
     def setUp(self):
         super(TestRolesClient, self).setUp()
         fake_auth = fake_auth_provider.FakeAuthProvider()
@@ -254,10 +306,17 @@
         self.check_service_client_function(
             self.client.list_role_inferences_rules,
             'tempest.lib.common.rest_client.RestClient.get',
-            self.FAKE_LIST_ROLE_INFERENCES_RULES,
+            self.FAKE_LIST_ROLE_INFERENCE_RULES,
             bytes_body,
             prior_role=self.FAKE_ROLE_ID)
 
+    def _test_list_all_role_inference_rules(self, bytes_body=False):
+        self.check_service_client_function(
+            self.client.list_all_role_inference_rules,
+            'tempest.lib.common.rest_client.RestClient.get',
+            self.FAKE_LIST_ALL_ROLE_INFERENCE_RULES,
+            bytes_body)
+
     def test_create_role_with_str_body(self):
         self._test_create_role()
 
@@ -441,3 +500,9 @@
             status=204,
             prior_role=self.FAKE_ROLE_ID,
             implies_role=self.FAKE_ROLE_ID_2)
+
+    def test_list_all_role_inference_rules_with_str_body(self):
+        self._test_list_all_role_inference_rules()
+
+    def test_list_all_role_inference_rules_with_bytes_body(self):
+        self._test_list_all_role_inference_rules(bytes_body=True)