diff --git a/doc/source/configuration/settings.rst b/doc/source/configuration/settings.rst
index 976f4696d1..afc537e004 100644
--- a/doc/source/configuration/settings.rst
+++ b/doc/source/configuration/settings.rst
@@ -2302,6 +2302,8 @@ OPENSTACK_NOVA_EXTENSIONS_BLACKLIST
 
 .. versionadded:: 8.0.0(Liberty)
 
+.. deprecated:: 17.2.0(Ussuri)
+
 Default: ``[]``
 
 Ignore all listed Nova extensions, and behave as if they were unsupported.
diff --git a/releasenotes/notes/deprecate-nova-extensions-blacklist-b6285bf02c4011f8.yaml b/releasenotes/notes/deprecate-nova-extensions-blacklist-b6285bf02c4011f8.yaml
new file mode 100644
index 0000000000..e5bab04827
--- /dev/null
+++ b/releasenotes/notes/deprecate-nova-extensions-blacklist-b6285bf02c4011f8.yaml
@@ -0,0 +1,9 @@
+---
+deprecations:
+  - |
+    ``OPENSTACK_NOVA_EXTENSIONS_BLACKLIST`` option is deprecated.
+    All of the nova API extensions have been mainlined several releases ago
+    and there is no potential performance issue in the nova API.
+    This option is used only to toggle features in horizon and
+    there seems no performance issues controlled by the option in horizon.
+    Considering this situation, this option is deprecated now.