diff --git a/releasenotes/notes/migrate-object-storage-as-stable-interface-42014c7b43ecb254.yaml b/releasenotes/notes/migrate-object-storage-as-stable-interface-42014c7b43ecb254.yaml
new file mode 100644
index 0000000..d38f562
--- /dev/null
+++ b/releasenotes/notes/migrate-object-storage-as-stable-interface-42014c7b43ecb254.yaml
@@ -0,0 +1,8 @@
+---
+features:
+  - |
+    Define object storage service clients as libraries
+    Add new service clients to the library interface so the other projects can use these modules as stable libraries without
+    any maintenance changes.
+
+      * bulk_middleware_client
diff --git a/tempest/lib/services/object_storage/__init__.py b/tempest/lib/services/object_storage/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tempest/lib/services/object_storage/__init__.py
diff --git a/tempest/services/object_storage/bulk_middleware_client.py b/tempest/lib/services/object_storage/bulk_middleware_client.py
similarity index 100%
rename from tempest/services/object_storage/bulk_middleware_client.py
rename to tempest/lib/services/object_storage/bulk_middleware_client.py
diff --git a/tempest/services/object_storage/__init__.py b/tempest/services/object_storage/__init__.py
index 1738566..f272378 100644
--- a/tempest/services/object_storage/__init__.py
+++ b/tempest/services/object_storage/__init__.py
@@ -12,9 +12,9 @@
 # License for the specific language governing permissions and limitations under
 # the License.
 
-from tempest.services.object_storage.account_client import AccountClient
-from tempest.services.object_storage.bulk_middleware_client import \
+from tempest.lib.services.object_storage.bulk_middleware_client import \
     BulkMiddlewareClient
+from tempest.services.object_storage.account_client import AccountClient
 from tempest.services.object_storage.capabilities_client import \
     CapabilitiesClient
 from tempest.services.object_storage.container_client import ContainerClient
diff --git a/tempest/tests/lib/services/object_storage/__init__.py b/tempest/tests/lib/services/object_storage/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tempest/tests/lib/services/object_storage/__init__.py
diff --git a/tempest/tests/services/object_storage/test_bulk_middleware_client.py b/tempest/tests/lib/services/object_storage/test_bulk_middleware_client.py
similarity index 96%
rename from tempest/tests/services/object_storage/test_bulk_middleware_client.py
rename to tempest/tests/lib/services/object_storage/test_bulk_middleware_client.py
index 163b48e..08028c3 100644
--- a/tempest/tests/services/object_storage/test_bulk_middleware_client.py
+++ b/tempest/tests/lib/services/object_storage/test_bulk_middleware_client.py
@@ -12,7 +12,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from tempest.services.object_storage import bulk_middleware_client
+from tempest.lib.services.object_storage import bulk_middleware_client
 from tempest.tests.lib import fake_auth_provider
 from tempest.tests.lib.services import base