diff --git a/nova/conf/s3.py b/nova/conf/s3.py
index 14ec6be921..b48ef8e1ae 100644
--- a/nova/conf/s3.py
+++ b/nova/conf/s3.py
@@ -19,30 +19,45 @@ from oslo_config import cfg
 
 s3_opts = [
     cfg.StrOpt('image_decryption_dir',
+               deprecated_for_removal=True,
+               deprecated_reason='EC2 API related options are not supported.',
                default='/tmp',
-               help='Parent directory for tempdir used for image decryption'),
+               help='DEPRECATED: Parent directory for tempdir used for image '
+                    'decryption'),
     cfg.StrOpt('s3_host',
+               deprecated_for_removal=True,
+               deprecated_reason='EC2 API related options are not supported.',
                default='$my_ip',
-               help='Hostname or IP for OpenStack to use when accessing '
-                    'the S3 api'),
+               help='DEPRECATED: Hostname or IP for OpenStack to use when '
+                    'accessing the S3 api'),
     cfg.IntOpt('s3_port',
+               deprecated_for_removal=True,
+               deprecated_reason='EC2 API related options are not supported.',
                default=3333,
                min=1,
                max=65535,
-               help='Port used when accessing the S3 api'),
+               help='DEPRECATED: Port used when accessing the S3 api'),
     cfg.StrOpt('s3_access_key',
+               deprecated_for_removal=True,
+               deprecated_reason='EC2 API related options are not supported.',
                default='notchecked',
-               help='Access key to use for S3 server for images'),
+               help='DEPRECATED: Access key to use for S3 server for images'),
     cfg.StrOpt('s3_secret_key',
+               deprecated_for_removal=True,
+               deprecated_reason='EC2 API related options are not supported.',
                default='notchecked',
-               help='Secret key to use for S3 server for images'),
+               help='DEPRECATED: Secret key to use for S3 server for images'),
     cfg.BoolOpt('s3_use_ssl',
+                deprecated_for_removal=True,
+                deprecated_reason='EC2 API related options are not supported.',
                 default=False,
-                help='Whether to use SSL when talking to S3'),
+                help='DEPRECATED: Whether to use SSL when talking to S3'),
     cfg.BoolOpt('s3_affix_tenant',
+                deprecated_for_removal=True,
+                deprecated_reason='EC2 API related options are not supported.',
                 default=False,
-                help='Whether to affix the tenant id to the access key '
-                     'when downloading from S3'),
+                help='DEPRECATED: Whether to affix the tenant id to the '
+                     'access key when downloading from S3'),
     ]
 
 
diff --git a/releasenotes/notes/deprecate-config-s3-image-adb7c86c9b9220a5.yaml b/releasenotes/notes/deprecate-config-s3-image-adb7c86c9b9220a5.yaml
new file mode 100644
index 0000000000..6de32c5048
--- /dev/null
+++ b/releasenotes/notes/deprecate-config-s3-image-adb7c86c9b9220a5.yaml
@@ -0,0 +1,9 @@
+---
+deprecations:
+  - As mentioned in the release notes of the Mitaka release (version 13.0.0),
+    the EC2API support was fully removed. The *s3* image service related
+    config options were still there but weren't used anywhere in the code
+    since Mitaka. These are now deprecated and may be removed as early as the
+    15.0.0 release. This affects ``image_decryption_dir``, ``s3_host``,
+    ``s3_port``, ``s3_access_key``, ``s3_secret_key``, ``s3_use_ssl``,
+    ``s3_affix_tenant``.
\ No newline at end of file