diff --git a/releasenotes/notes/13.1.0-volume-clients-as-library-309030c7a16e62ab.yaml b/releasenotes/notes/13.1.0-volume-clients-as-library-309030c7a16e62ab.yaml
new file mode 100644
index 0000000..056e199
--- /dev/null
+++ b/releasenotes/notes/13.1.0-volume-clients-as-library-309030c7a16e62ab.yaml
@@ -0,0 +1,10 @@
+---
+features:
+  - |
+    Define volume service clients as libraries.
+    The following volume service clients are defined as library interface,
+    so the other projects can use these modules as stable libraries without
+    any maintenance changes.
+
+    * volumes_client(v1)
+    * volumes_client(v2)
diff --git a/tempest/services/volume/base/base_volumes_client.py b/tempest/lib/services/volume/v1/volumes_client.py
similarity index 98%
rename from tempest/services/volume/base/base_volumes_client.py
rename to tempest/lib/services/volume/v1/volumes_client.py
index 1cb1ef5..3df8da4 100644
--- a/tempest/services/volume/base/base_volumes_client.py
+++ b/tempest/lib/services/volume/v1/volumes_client.py
@@ -21,11 +21,9 @@
 from tempest.lib import exceptions as lib_exc
 
 
-class BaseVolumesClient(rest_client.RestClient):
+class VolumesClient(rest_client.RestClient):
     """Base client class to send CRUD Volume API requests"""
 
-    create_resp = 200
-
     def _prepare_params(self, params):
         """Prepares params for use in get or _ext_get methods.
 
@@ -69,7 +67,7 @@
         post_body = json.dumps({'volume': kwargs})
         resp, body = self.post('volumes', post_body)
         body = json.loads(body)
-        self.expected_success(self.create_resp, resp.status)
+        self.expected_success(200, resp.status)
         return rest_client.ResponseBody(resp, body)
 
     def update_volume(self, volume_id, **kwargs):
diff --git a/tempest/services/volume/base/base_volumes_client.py b/tempest/lib/services/volume/v2/volumes_client.py
similarity index 84%
copy from tempest/services/volume/base/base_volumes_client.py
copy to tempest/lib/services/volume/v2/volumes_client.py
index 1cb1ef5..b1930e1 100644
--- a/tempest/services/volume/base/base_volumes_client.py
+++ b/tempest/lib/services/volume/v2/volumes_client.py
@@ -21,10 +21,9 @@
 from tempest.lib import exceptions as lib_exc
 
 
-class BaseVolumesClient(rest_client.RestClient):
-    """Base client class to send CRUD Volume API requests"""
-
-    create_resp = 200
+class VolumesClient(rest_client.RestClient):
+    """Client class to send CRUD Volume V2 API requests"""
+    api_version = "v2"
 
     def _prepare_params(self, params):
         """Prepares params for use in get or _ext_get methods.
@@ -69,7 +68,7 @@
         post_body = json.dumps({'volume': kwargs})
         resp, body = self.post('volumes', post_body)
         body = json.loads(body)
-        self.expected_success(self.create_resp, resp.status)
+        self.expected_success(202, resp.status)
         return rest_client.ResponseBody(resp, body)
 
     def update_volume(self, volume_id, **kwargs):
@@ -293,3 +292,49 @@
         post_body = json.dumps({'os-retype': kwargs})
         resp, body = self.post('volumes/%s/action' % volume_id, post_body)
         self.expected_success(202, resp.status)
+
+    def update_volume_image_metadata(self, volume_id, **kwargs):
+        """Update image metadata for the volume.
+
+        Available params: see http://developer.openstack.org/
+                              api-ref-blockstorage-v2.html
+                              #setVolumeimagemetadata
+        """
+        post_body = json.dumps({'os-set_image_metadata': {'metadata': kwargs}})
+        url = "volumes/%s/action" % (volume_id)
+        resp, body = self.post(url, post_body)
+        body = json.loads(body)
+        self.expected_success(200, resp.status)
+        return rest_client.ResponseBody(resp, body)
+
+    def delete_volume_image_metadata(self, volume_id, key_name):
+        """Delete image metadata item for the volume."""
+        post_body = json.dumps({'os-unset_image_metadata': {'key': key_name}})
+        url = "volumes/%s/action" % (volume_id)
+        resp, body = self.post(url, post_body)
+        self.expected_success(200, resp.status)
+        return rest_client.ResponseBody(resp, body)
+
+    def show_pools(self, detail=False):
+        # List all the volumes pools (hosts)
+        url = 'scheduler-stats/get_pools'
+        if detail:
+            url += '?detail=True'
+
+        resp, body = self.get(url)
+        body = json.loads(body)
+        self.expected_success(200, resp.status)
+        return rest_client.ResponseBody(resp, body)
+
+    def show_backend_capabilities(self, host):
+        """Shows capabilities for a storage back end.
+
+         Output params: see http://developer.openstack.org/
+                            api-ref-blockstorage-v2.html
+                            #showBackendCapabilities
+        """
+        url = 'capabilities/%s' % host
+        resp, body = self.get(url)
+        body = json.loads(body)
+        self.expected_success(200, resp.status)
+        return rest_client.ResponseBody(resp, body)
diff --git a/tempest/services/volume/v1/__init__.py b/tempest/services/volume/v1/__init__.py
index 376ab72..7fb3ed3 100644
--- a/tempest/services/volume/v1/__init__.py
+++ b/tempest/services/volume/v1/__init__.py
@@ -24,7 +24,7 @@
 from tempest.lib.services.volume.v1.services_client import ServicesClient
 from tempest.lib.services.volume.v1.snapshots_client import SnapshotsClient
 from tempest.lib.services.volume.v1.types_client import TypesClient
-from tempest.services.volume.v1.json.volumes_client import VolumesClient
+from tempest.lib.services.volume.v1.volumes_client import VolumesClient
 
 __all__ = ['AvailabilityZoneClient', 'EncryptionTypesClient',
            'ExtensionsClient', 'HostsClient', 'QuotasClient',
diff --git a/tempest/services/volume/v1/json/volumes_client.py b/tempest/services/volume/v1/json/volumes_client.py
deleted file mode 100644
index 7782043..0000000
--- a/tempest/services/volume/v1/json/volumes_client.py
+++ /dev/null
@@ -1,20 +0,0 @@
-# Copyright 2012 OpenStack Foundation
-# All Rights Reserved.
-#
-#    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.
-
-from tempest.services.volume.base import base_volumes_client
-
-
-class VolumesClient(base_volumes_client.BaseVolumesClient):
-    """Client class to send CRUD Volume V1 API requests"""
diff --git a/tempest/services/volume/v2/__init__.py b/tempest/services/volume/v2/__init__.py
index 5774977..8edaf2a 100644
--- a/tempest/services/volume/v2/__init__.py
+++ b/tempest/services/volume/v2/__init__.py
@@ -24,7 +24,7 @@
 from tempest.lib.services.volume.v2.services_client import ServicesClient
 from tempest.lib.services.volume.v2.snapshots_client import SnapshotsClient
 from tempest.lib.services.volume.v2.types_client import TypesClient
-from tempest.services.volume.v2.json.volumes_client import VolumesClient
+from tempest.lib.services.volume.v2.volumes_client import VolumesClient
 
 __all__ = ['AvailabilityZoneClient', 'BackupsClient', 'EncryptionTypesClient',
            'ExtensionsClient', 'HostsClient', 'QosSpecsClient', 'QuotasClient',
diff --git a/tempest/services/volume/v2/json/volumes_client.py b/tempest/services/volume/v2/json/volumes_client.py
deleted file mode 100644
index f21a1a3..0000000
--- a/tempest/services/volume/v2/json/volumes_client.py
+++ /dev/null
@@ -1,71 +0,0 @@
-# Copyright 2012 OpenStack Foundation
-# All Rights Reserved.
-#
-#    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.
-
-from oslo_serialization import jsonutils as json
-
-from tempest.lib.common import rest_client
-from tempest.services.volume.base import base_volumes_client
-
-
-class VolumesClient(base_volumes_client.BaseVolumesClient):
-    """Client class to send CRUD Volume V2 API requests"""
-    api_version = "v2"
-    create_resp = 202
-
-    def update_volume_image_metadata(self, volume_id, **kwargs):
-        """Update image metadata for the volume.
-
-        Available params: see http://developer.openstack.org/
-                              api-ref-blockstorage-v2.html
-                              #setVolumeimagemetadata
-        """
-        post_body = json.dumps({'os-set_image_metadata': {'metadata': kwargs}})
-        url = "volumes/%s/action" % (volume_id)
-        resp, body = self.post(url, post_body)
-        body = json.loads(body)
-        self.expected_success(200, resp.status)
-        return rest_client.ResponseBody(resp, body)
-
-    def delete_volume_image_metadata(self, volume_id, key_name):
-        """Delete image metadata item for the volume."""
-        post_body = json.dumps({'os-unset_image_metadata': {'key': key_name}})
-        url = "volumes/%s/action" % (volume_id)
-        resp, body = self.post(url, post_body)
-        self.expected_success(200, resp.status)
-        return rest_client.ResponseBody(resp, body)
-
-    def show_pools(self, detail=False):
-        # List all the volumes pools (hosts)
-        url = 'scheduler-stats/get_pools'
-        if detail:
-            url += '?detail=True'
-
-        resp, body = self.get(url)
-        body = json.loads(body)
-        self.expected_success(200, resp.status)
-        return rest_client.ResponseBody(resp, body)
-
-    def show_backend_capabilities(self, host):
-        """Shows capabilities for a storage back end.
-
-         Output params: see http://developer.openstack.org/
-                            api-ref-blockstorage-v2.html
-                            #showBackendCapabilities
-        """
-        url = 'capabilities/%s' % host
-        resp, body = self.get(url)
-        body = json.loads(body)
-        self.expected_success(200, resp.status)
-        return rest_client.ResponseBody(resp, body)
diff --git a/tempest/tests/common/test_waiters.py b/tempest/tests/common/test_waiters.py
index a56f837..a826337 100644
--- a/tempest/tests/common/test_waiters.py
+++ b/tempest/tests/common/test_waiters.py
@@ -18,7 +18,7 @@
 
 from tempest.common import waiters
 from tempest import exceptions
-from tempest.services.volume.base import base_volumes_client
+from tempest.lib.services.volume.v2 import volumes_client
 from tempest.tests import base
 import tempest.tests.utils as utils
 
@@ -57,7 +57,7 @@
     def test_wait_for_volume_status_error_restoring(self, mock_sleep):
         # Tests that the wait method raises VolumeRestoreErrorException if
         # the volume status is 'error_restoring'.
-        client = mock.Mock(spec=base_volumes_client.BaseVolumesClient,
+        client = mock.Mock(spec=volumes_client.VolumesClient,
                            build_interval=1)
         volume1 = {'volume': {'status': 'restoring-backup'}}
         volume2 = {'volume': {'status': 'error_restoring'}}