diff --git a/nova/network/constants.py b/nova/network/constants.py
index eff49022c16a..d98e217f95d1 100644
--- a/nova/network/constants.py
+++ b/nova/network/constants.py
@@ -40,7 +40,6 @@ RESOURCE_REQUEST_GROUPS = 'port-resource-request-groups'
 # Third-party extensions
 
 VNIC_INDEX = 'vnic-index'  # this is provided by the vmware_nsx project
-QOS_QUEUE = 'qos-queue'  # TODO(stephenfin): what defines this? Xen?
 
 # Search fields
 
diff --git a/nova/network/neutron.py b/nova/network/neutron.py
index 73b2376950c8..c5e1c8e74698 100644
--- a/nova/network/neutron.py
+++ b/nova/network/neutron.py
@@ -1385,16 +1385,6 @@ class API:
             constants.RESOURCE_REQUEST_GROUPS, context, client,
         )
 
-    # TODO(stephenfin): This is optionally used by the XenAPI virt driver, but
-    # I can't find what defines it and suspect it's dead code. Consider
-    # removing the functionality
-    def has_qos_queue_extension(self, context=None, client=None):
-        """Check if the 'qos-queue' extension is enabled.
-
-        This extension is provided by a XenServer neutron plugin...we think.
-        """
-        return self._has_extension(constants.QOS_QUEUE, context, client)
-
     def has_vnic_index_extension(self, context=None, client=None):
         """Check if the 'vnic-index' extension is enabled.
 
@@ -1644,10 +1634,6 @@ class API:
         if neutron is None:
             neutron = get_client(context)
 
-        if self.has_qos_queue_extension(client=neutron):
-            flavor = instance.get_flavor()
-            rxtx_factor = flavor.get('rxtx_factor')
-            port_req_body['port']['rxtx_factor'] = rxtx_factor
         port_req_body['port'][constants.BINDING_HOST_ID] = bind_host_id
         self._populate_neutron_binding_profile(instance,
                                                pci_request_id,
diff --git a/nova/tests/unit/network/test_neutron.py b/nova/tests/unit/network/test_neutron.py
index b717e509dff8..4b4a2e1f7759 100644
--- a/nova/tests/unit/network/test_neutron.py
+++ b/nova/tests/unit/network/test_neutron.py
@@ -1173,31 +1173,13 @@ class TestAPI(TestAPIBase):
     def test_refresh_neutron_extensions_cache(self):
         mocked_client = mock.create_autospec(client.Client)
         mocked_client.list_extensions.return_value = {
-            'extensions': [{'alias': constants.QOS_QUEUE}]}
+            'extensions': [{'alias': constants.DNS_INTEGRATION}]}
         self.api._refresh_neutron_extensions_cache(mocked_client)
         self.assertEqual(
-            {constants.QOS_QUEUE: {'alias': constants.QOS_QUEUE}},
+            {constants.DNS_INTEGRATION: {'alias': constants.DNS_INTEGRATION}},
             self.api.extensions)
         mocked_client.list_extensions.assert_called_once_with()
 
-    @mock.patch.object(neutronapi, 'get_client')
-    def test_populate_neutron_extension_values_rxtx_factor(
-            self, mock_get_client):
-        mocked_client = mock.create_autospec(client.Client)
-        mock_get_client.return_value = mocked_client
-        mocked_client.list_extensions.return_value = {
-            'extensions': [{'alias': constants.QOS_QUEUE}]}
-        flavor = objects.Flavor.get_by_name(self.context, 'm1.small')
-        flavor['rxtx_factor'] = 1
-        instance = objects.Instance(system_metadata={})
-        instance.flavor = flavor
-        port_req_body = {'port': {}}
-        self.api._populate_neutron_extension_values(self.context, instance,
-                                                    None, port_req_body)
-        self.assertEqual(1, port_req_body['port']['rxtx_factor'])
-        mock_get_client.assert_called_once_with(self.context)
-        mocked_client.list_extensions.assert_called_once_with()
-
     def test_allocate_for_instance_1(self):
         # Allocate one port in one network env.
         self._test_allocate_for_instance_with_virtual_interface(1)
diff --git a/releasenotes/notes/remove-qos-queue-vmware-nsx-extension-208d72da23e7ae49.yaml b/releasenotes/notes/remove-qos-queue-vmware-nsx-extension-208d72da23e7ae49.yaml
new file mode 100644
index 000000000000..9c5fb49af869
--- /dev/null
+++ b/releasenotes/notes/remove-qos-queue-vmware-nsx-extension-208d72da23e7ae49.yaml
@@ -0,0 +1,7 @@
+---
+upgrade:
+  - |
+    Support for the ``qos-queue`` extension provided by the vmware-nsx neutron
+    plugin for the VMWare NSX Manager has been removed. This extension was
+    removed from the vmware-nsx project when support for NSX-MH was removed in
+    15.0.0.