diff --git a/api-ref/source/v3/consistencygroups-v3.inc b/api-ref/source/v3/consistencygroups-v3.inc
index e05b1253de1..ca1ca892079 100644
--- a/api-ref/source/v3/consistencygroups-v3.inc
+++ b/api-ref/source/v3/consistencygroups-v3.inc
@@ -1,7 +1,7 @@
 .. -*- rst -*-
 
-Consistency groups
-==================
+Consistency groups (DEPRECATED)
+===============================
 
 Consistency groups enable you to create snapshots at the exact same
 point in time from multiple volumes. For example, a database might
diff --git a/api-ref/source/v3/os-cgsnapshots-v3.inc b/api-ref/source/v3/os-cgsnapshots-v3.inc
index 36fa77512c7..c1fe6c6727c 100644
--- a/api-ref/source/v3/os-cgsnapshots-v3.inc
+++ b/api-ref/source/v3/os-cgsnapshots-v3.inc
@@ -1,7 +1,7 @@
 .. -*- rst -*-
 
-Consistency group snapshots
-===========================
+Consistency group snapshots (DEPRECATED)
+========================================
 
 Lists all, lists all with details, shows details for, creates, and
 deletes consistency group snapshots.
diff --git a/cinder/api/contrib/cgsnapshots.py b/cinder/api/contrib/cgsnapshots.py
index 02b37a07de4..5eba06de689 100644
--- a/cinder/api/contrib/cgsnapshots.py
+++ b/cinder/api/contrib/cgsnapshots.py
@@ -16,6 +16,7 @@
 """The cgsnapshots api."""
 
 from oslo_log import log as logging
+from oslo_log import versionutils
 import six
 from six.moves import http_client
 import webob
@@ -30,6 +31,8 @@ from cinder import group as group_api
 from cinder.i18n import _
 
 LOG = logging.getLogger(__name__)
+DEPRECATE_CGSNAP_API_MSG = ("Consistency Group Snapshot APIs are deprecated. "
+                            "Use Generic Volume Group Snapshot APIs instead.")
 
 
 class CgsnapshotsController(wsgi.Controller):
@@ -43,6 +46,7 @@ class CgsnapshotsController(wsgi.Controller):
 
     def show(self, req, id):
         """Return data about the given cgsnapshot."""
+        versionutils.report_deprecated_feature(LOG, DEPRECATE_CGSNAP_API_MSG)
         LOG.debug('show called for member %s', id)
         context = req.environ['cinder.context']
 
@@ -53,6 +57,7 @@ class CgsnapshotsController(wsgi.Controller):
 
     def delete(self, req, id):
         """Delete a cgsnapshot."""
+        versionutils.report_deprecated_feature(LOG, DEPRECATE_CGSNAP_API_MSG)
         LOG.debug('delete called for member %s', id)
         context = req.environ['cinder.context']
 
@@ -74,10 +79,12 @@ class CgsnapshotsController(wsgi.Controller):
 
     def index(self, req):
         """Returns a summary list of cgsnapshots."""
+        versionutils.report_deprecated_feature(LOG, DEPRECATE_CGSNAP_API_MSG)
         return self._get_cgsnapshots(req, is_detail=False)
 
     def detail(self, req):
         """Returns a detailed list of cgsnapshots."""
+        versionutils.report_deprecated_feature(LOG, DEPRECATE_CGSNAP_API_MSG)
         return self._get_cgsnapshots(req, is_detail=True)
 
     def _get_cg(self, context, id):
@@ -112,6 +119,7 @@ class CgsnapshotsController(wsgi.Controller):
     @wsgi.response(http_client.ACCEPTED)
     def create(self, req, body):
         """Create a new cgsnapshot."""
+        versionutils.report_deprecated_feature(LOG, DEPRECATE_CGSNAP_API_MSG)
         LOG.debug('Creating new cgsnapshot %s', body)
         self.assert_valid_body(body, 'cgsnapshot')
 
diff --git a/cinder/api/contrib/consistencygroups.py b/cinder/api/contrib/consistencygroups.py
index 02be5fac3c9..6f313c67400 100644
--- a/cinder/api/contrib/consistencygroups.py
+++ b/cinder/api/contrib/consistencygroups.py
@@ -16,6 +16,7 @@
 """The consistencygroups api."""
 
 from oslo_log import log as logging
+from oslo_log import versionutils
 from oslo_utils import strutils
 from six.moves import http_client
 import webob
@@ -33,6 +34,8 @@ from cinder.policies import groups as group_policy
 from cinder.volume import group_types
 
 LOG = logging.getLogger(__name__)
+DEPRECATE_CG_API_MSG = ("Consistency Group APIs are deprecated. "
+                        "Use Generic Volume Group APIs instead.")
 
 
 class ConsistencyGroupsController(wsgi.Controller):
@@ -46,6 +49,7 @@ class ConsistencyGroupsController(wsgi.Controller):
 
     def show(self, req, id):
         """Return data about the given consistency group."""
+        versionutils.report_deprecated_feature(LOG, DEPRECATE_CG_API_MSG)
         LOG.debug('show called for member %s', id)
         context = req.environ['cinder.context']
 
@@ -56,6 +60,7 @@ class ConsistencyGroupsController(wsgi.Controller):
 
     def delete(self, req, id, body):
         """Delete a consistency group."""
+        versionutils.report_deprecated_feature(LOG, DEPRECATE_CG_API_MSG)
         LOG.debug('delete called for member %s', id)
         context = req.environ['cinder.context']
         force = False
@@ -84,10 +89,12 @@ class ConsistencyGroupsController(wsgi.Controller):
 
     def index(self, req):
         """Returns a summary list of consistency groups."""
+        versionutils.report_deprecated_feature(LOG, DEPRECATE_CG_API_MSG)
         return self._get_consistencygroups(req, is_detail=False)
 
     def detail(self, req):
         """Returns a detailed list of consistency groups."""
+        versionutils.report_deprecated_feature(LOG, DEPRECATE_CG_API_MSG)
         return self._get_consistencygroups(req, is_detail=True)
 
     def _get(self, context, id):
@@ -129,6 +136,7 @@ class ConsistencyGroupsController(wsgi.Controller):
     @wsgi.response(http_client.ACCEPTED)
     def create(self, req, body):
         """Create a new consistency group."""
+        versionutils.report_deprecated_feature(LOG, DEPRECATE_CG_API_MSG)
         LOG.debug('Creating new consistency group %s', body)
         self.assert_valid_body(body, 'consistencygroup')
 
@@ -179,6 +187,7 @@ class ConsistencyGroupsController(wsgi.Controller):
         this does not require volume_types as the "create"
         API above.
         """
+        versionutils.report_deprecated_feature(LOG, DEPRECATE_CG_API_MSG)
         LOG.debug('Creating new consistency group %s.', body)
         self.assert_valid_body(body, 'consistencygroup-from-src')
 
@@ -267,6 +276,7 @@ class ConsistencyGroupsController(wsgi.Controller):
             }
 
         """
+        versionutils.report_deprecated_feature(LOG, DEPRECATE_CG_API_MSG)
         LOG.debug('Update called for consistency group %s.', id)
         if not body:
             msg = _("Missing request body.")
diff --git a/releasenotes/notes/deprecate-consistency-group-apis-0d9120d16f090781.yaml b/releasenotes/notes/deprecate-consistency-group-apis-0d9120d16f090781.yaml
new file mode 100644
index 00000000000..fe0c6c0216a
--- /dev/null
+++ b/releasenotes/notes/deprecate-consistency-group-apis-0d9120d16f090781.yaml
@@ -0,0 +1,6 @@
+---
+deprecations:
+  - |
+    The Consistency Group APIs have now been marked as deprecated and
+    will be removed in a future release. Generic Volume Group APIs should
+    be used instead.