diff --git a/neutron/objects/qos/rule.py b/neutron/objects/qos/rule.py
index d2434322ec0..d24f808e90f 100644
--- a/neutron/objects/qos/rule.py
+++ b/neutron/objects/qos/rule.py
@@ -85,12 +85,18 @@ class QosRule(base.NeutronDbObject):
         is_network_device_port = any(port['device_owner'].startswith(prefix)
                                      for prefix
                                      in constants.DEVICE_OWNER_PREFIXES)
+        # NOTE(miouge): Network QoS policies should apply to ext routers ports:
+        # - DEVICE_OWNER_AGENT_GW for DVR routers
+        # - DEVICE_OWNER_ROUTER_GW for normal neutron routers
+        is_router_gw = any(port['device_owner'].startswith(prefix)
+                           for prefix in [constants.DEVICE_OWNER_AGENT_GW,
+                                          constants.DEVICE_OWNER_ROUTER_GW])
         # NOTE(ralonsoh): return True if:
         #    - Is a port QoS policy (not a network QoS policy)
-        #    - Is not a network device (e.g. router) and is a network QoS
-        #      policy and there is no port QoS policy
-        return (is_port_policy or
-                (not is_network_device_port and is_network_policy_only))
+        #    - Is not an internal network device (e.g. router) and is a network
+        #      QoS policy and there is no port QoS policy
+        return (is_port_policy or ((is_router_gw or not is_network_device_port)
+                                   and is_network_policy_only))
 
 
 @obj_base.VersionedObjectRegistry.register
diff --git a/neutron/tests/unit/objects/qos/test_rule.py b/neutron/tests/unit/objects/qos/test_rule.py
index eeaba771164..912835a311a 100644
--- a/neutron/tests/unit/objects/qos/test_rule.py
+++ b/neutron/tests/unit/objects/qos/test_rule.py
@@ -79,6 +79,34 @@ class QosRuleObjectTestCase(neutron_test_base.BaseTestCase):
             device_owner=DEVICE_OWNER_COMPUTE,
             expected_result=True)
 
+    def test_should_apply_to_port_with_router_gw_port_and_net_policy(self):
+        self._test_should_apply_to_port(
+            rule_policy_id=POLICY_ID_B,
+            port_policy_id=POLICY_ID_A,
+            device_owner=constants.DEVICE_OWNER_ROUTER_GW,
+            expected_result=False)
+
+    def test_should_apply_to_port_with_router_gw_port_and_port_policy(self):
+        self._test_should_apply_to_port(
+            rule_policy_id=POLICY_ID_A,
+            port_policy_id=POLICY_ID_A,
+            device_owner=constants.DEVICE_OWNER_ROUTER_GW,
+            expected_result=True)
+
+    def test_should_apply_to_port_with_agent_gw_port_and_net_policy(self):
+        self._test_should_apply_to_port(
+            rule_policy_id=POLICY_ID_B,
+            port_policy_id=POLICY_ID_A,
+            device_owner=constants.DEVICE_OWNER_AGENT_GW,
+            expected_result=False)
+
+    def test_should_apply_to_port_with_agent_gw_port_and_port_policy(self):
+        self._test_should_apply_to_port(
+            rule_policy_id=POLICY_ID_A,
+            port_policy_id=POLICY_ID_A,
+            device_owner=constants.DEVICE_OWNER_AGENT_GW,
+            expected_result=True)
+
 
 class QosBandwidthLimitRuleObjectTestCase(test_base.BaseObjectIfaceTestCase):
 
diff --git a/releasenotes/notes/qos-for-router-gateway-02340f7aa8be3b0d.yaml b/releasenotes/notes/qos-for-router-gateway-02340f7aa8be3b0d.yaml
new file mode 100644
index 00000000000..1423c100ea9
--- /dev/null
+++ b/releasenotes/notes/qos-for-router-gateway-02340f7aa8be3b0d.yaml
@@ -0,0 +1,6 @@
+prelude: >
+    Network QoS policies are now supported for network:router_gateway ports.
+features:
+  - |
+    Neutron QoS policies set on an external network now apply to external
+    router ports (DVR or not).