diff --git a/tempest/lib/services/volume/v2/volumes_client.py b/tempest/lib/services/volume/v2/volumes_client.py
index d31259f..62b9992 100644
--- a/tempest/lib/services/volume/v2/volumes_client.py
+++ b/tempest/lib/services/volume/v2/volumes_client.py
@@ -318,6 +318,7 @@
         post_body = json.dumps({'os-retype': kwargs})
         resp, body = self.post('volumes/%s/action' % volume_id, post_body)
         self.expected_success(202, resp.status)
+        return rest_client.ResponseBody(resp, body)
 
     def force_detach_volume(self, volume_id, **kwargs):
         """Force detach a volume.
diff --git a/tempest/releasenotes/notes/add-return-value-to-retype-volume-a401aa619aaa2457.yaml b/tempest/releasenotes/notes/add-return-value-to-retype-volume-a401aa619aaa2457.yaml
new file mode 100644
index 0000000..4abfe9e
--- /dev/null
+++ b/tempest/releasenotes/notes/add-return-value-to-retype-volume-a401aa619aaa2457.yaml
@@ -0,0 +1,5 @@
+---
+fixes:
+  Add a missing return statement to the retype_volume API in the v2 volumes_client library.
+  This changes the response body from None to an empty dictionary.
+
diff --git a/tempest/tests/lib/services/volume/v2/test_volumes_client.py b/tempest/tests/lib/services/volume/v2/test_volumes_client.py
index befb1f6..e53e0a2 100644
--- a/tempest/tests/lib/services/volume/v2/test_volumes_client.py
+++ b/tempest/tests/lib/services/volume/v2/test_volumes_client.py
@@ -33,6 +33,22 @@
                                                    'volume',
                                                    'regionOne')
 
+    def _test_retype_volume(self, bytes_body=False):
+        kwargs = {
+            "new_type": "dedup-tier-replication",
+            "migration_policy": "never"
+        }
+
+        self.check_service_client_function(
+            self.client.retype_volume,
+            'tempest.lib.common.rest_client.RestClient.post',
+            {},
+            to_utf=bytes_body,
+            status=202,
+            volume_id="a3be971b-8de5-4bdf-bdb8-3d8eb0fb69f8",
+            **kwargs
+        )
+
     def _test_force_detach_volume(self, bytes_body=False):
         kwargs = {
             'attachment_id': '6980e295-920f-412e-b189-05c50d605acd',
@@ -71,3 +87,9 @@
 
     def test_show_volume_metadata_item_with_bytes_body(self):
         self._test_show_volume_metadata_item(bytes_body=True)
+
+    def test_retype_volume_with_str_body(self):
+        self._test_retype_volume()
+
+    def test_retype_volume_with_bytes_body(self):
+        self._test_retype_volume(bytes_body=True)