diff --git a/neutron/common/config.py b/neutron/common/config.py
index a0f52f07661..c92106cd63e 100644
--- a/neutron/common/config.py
+++ b/neutron/common/config.py
@@ -144,9 +144,12 @@ core_opts = [
                       "services running on this machine must use the same "
                       "host value.")),
     cfg.BoolOpt('force_gateway_on_subnet', default=True,
+                deprecated_for_removal=True,
                 help=_("Ensure that configured gateway is on subnet. "
                        "For IPv6, validate only if gateway is not a link "
-                       "local address.")),
+                       "local address. Deprecated, to be removed during the "
+                       "Newton release, at which point the gateway will not "
+                       "be forced on to subnet.")),
     cfg.BoolOpt('notify_nova_on_port_status_changes', default=True,
                 help=_("Send notification to nova when port status changes")),
     cfg.BoolOpt('notify_nova_on_port_data_changes', default=True,
diff --git a/releasenotes/notes/deprecate-force_gateway_on_subnet-376855c4e66f4e11.yaml b/releasenotes/notes/deprecate-force_gateway_on_subnet-376855c4e66f4e11.yaml
new file mode 100644
index 00000000000..b6d15cb07d2
--- /dev/null
+++ b/releasenotes/notes/deprecate-force_gateway_on_subnet-376855c4e66f4e11.yaml
@@ -0,0 +1,4 @@
+---
+deprecations:
+  - The 'force_gateway_on_subnet' option is deprecated and
+    will be removed in the 'Newton' cycle.