diff --git a/heat/engine/clients/os/nova.py b/heat/engine/clients/os/nova.py
index f986a95ad6..d8cd22a6fe 100644
--- a/heat/engine/clients/os/nova.py
+++ b/heat/engine/clients/os/nova.py
@@ -82,11 +82,9 @@ class NovaClientPlugin(microversion_mixin.MicroversionMixin,
 
     def _get_args(self, version):
         endpoint_type = self._get_client_option(CLIENT_NAME, 'endpoint_type')
-        extensions = nc.discover_extensions(version)
 
         return {
             'session': self.context.keystone_session,
-            'extensions': extensions,
             'endpoint_type': endpoint_type,
             'service_type': self.COMPUTE,
             'region_name': self._get_region_name(),
@@ -829,15 +827,6 @@ echo -e '%s\tALL=(ALL)\tNOPASSWD: ALL' >> /etc/sudoers
                     return True
         return False
 
-    @os_client.MEMOIZE_EXTENSIONS
-    def _list_extensions(self):
-        extensions = self.client().list_extensions.show_all()
-        return set(extension.alias for extension in extensions)
-
-    def has_extension(self, alias):
-        """Check if specific extension is present."""
-        return alias in self._list_extensions()
-
 
 class NovaBaseConstraint(constraints.BaseCustomConstraint):
 
diff --git a/heat/engine/resources/openstack/nova/keypair.py b/heat/engine/resources/openstack/nova/keypair.py
index bff7c7ba64..9104c87775 100644
--- a/heat/engine/resources/openstack/nova/keypair.py
+++ b/heat/engine/resources/openstack/nova/keypair.py
@@ -43,8 +43,6 @@ class KeyPair(resource.Resource):
 
     support_status = support.SupportStatus(version='2014.1')
 
-    required_service_extension = 'os-keypairs'
-
     PROPERTIES = (
         NAME, SAVE_PRIVATE_KEY, PUBLIC_KEY, KEY_TYPE, USER,
     ) = (
diff --git a/heat/engine/resources/openstack/nova/quota.py b/heat/engine/resources/openstack/nova/quota.py
index 269fcdaa72..c68b8a8a1a 100644
--- a/heat/engine/resources/openstack/nova/quota.py
+++ b/heat/engine/resources/openstack/nova/quota.py
@@ -53,8 +53,6 @@ class NovaQuota(resource.Resource):
 
     entity = 'quotas'
 
-    required_service_extension = 'os-quota-sets'
-
     PROPERTIES = (
         PROJECT, CORES, FIXED_IPS, FLOATING_IPS, INSTANCES,
         INJECTED_FILES, INJECTED_FILE_CONTENT_BYTES, INJECTED_FILE_PATH_BYTES,
diff --git a/heat/engine/resources/openstack/nova/server_group.py b/heat/engine/resources/openstack/nova/server_group.py
index 5b5a4c3ff6..abaa8c6b76 100644
--- a/heat/engine/resources/openstack/nova/server_group.py
+++ b/heat/engine/resources/openstack/nova/server_group.py
@@ -33,8 +33,6 @@ class ServerGroup(resource.Resource):
 
     entity = 'server_groups'
 
-    required_service_extension = 'os-server-groups'
-
     PROPERTIES = (
         NAME, POLICIES
     ) = (
diff --git a/heat/engine/resources/openstack/nova/server_network_mixin.py b/heat/engine/resources/openstack/nova/server_network_mixin.py
index 6679710e5a..c035142627 100644
--- a/heat/engine/resources/openstack/nova/server_network_mixin.py
+++ b/heat/engine/resources/openstack/nova/server_network_mixin.py
@@ -190,12 +190,6 @@ class ServerNetworkMixin(object):
         creating. We need to store information about that ports, so store
         their IDs to data with key `external_ports`.
         """
-        # check if os-attach-interfaces extension is available on this cloud.
-        # If it's not, then novaclient's interface_list method cannot be used
-        # to get the list of interfaces.
-        if not self.client_plugin().has_extension('os-attach-interfaces'):
-            return
-
         server = self.client().servers.get(self.resource_id)
         ifaces = server.interface_list()
         external_port_ids = set(iface.port_id for iface in ifaces)
diff --git a/heat/tests/clients/test_nova_client.py b/heat/tests/clients/test_nova_client.py
index 32c55c7132..afd3caaf6e 100644
--- a/heat/tests/clients/test_nova_client.py
+++ b/heat/tests/clients/test_nova_client.py
@@ -45,27 +45,21 @@ class NovaClientPluginTest(NovaClientPluginTestCase):
 
     def test_create(self):
         context = utils.dummy_context()
-        ext_mock = self.patchobject(nc, 'discover_extensions')
         plugin = context.clients.client_plugin('nova')
         plugin.max_microversion = '2.53'
         client = plugin.client()
-        ext_mock.assert_called_once_with('2.53')
         self.assertIsNotNone(client.servers)
 
     def test_v2_26_create(self):
         ctxt = utils.dummy_context()
-        ext_mock = self.patchobject(nc, 'discover_extensions')
         self.patchobject(nc, 'Client', return_value=mock.Mock())
 
         plugin = ctxt.clients.client_plugin('nova')
         plugin.max_microversion = '2.53'
         plugin.client(version='2.26')
 
-        ext_mock.assert_called_once_with('2.26')
-
     def test_v2_26_create_failed(self):
         ctxt = utils.dummy_context()
-        self.patchobject(nc, 'discover_extensions')
         plugin = ctxt.clients.client_plugin('nova')
         plugin.max_microversion = '2.23'
         client_stub = mock.Mock()
@@ -654,30 +648,3 @@ class ConsoleUrlsTest(common.HeatTestCase):
         self.console_method.side_effect = exc("spam")
 
         self._test_get_console_url_tolerate_exception('spam')
-
-
-class NovaClientPluginExtensionsTest(NovaClientPluginTestCase):
-    """Tests for extensions in novaclient."""
-
-    def test_has_no_extensions(self):
-        self.nova_client.list_extensions.show_all.return_value = []
-        self.assertFalse(self.nova_plugin.has_extension(
-            "os-virtual-interfaces"))
-
-    def test_has_no_interface_extensions(self):
-        mock_extension = mock.Mock()
-        p = mock.PropertyMock(return_value='os-xxxx')
-        type(mock_extension).alias = p
-        self.nova_client.list_extensions.show_all.return_value = [
-            mock_extension]
-        self.assertFalse(self.nova_plugin.has_extension(
-            "os-virtual-interfaces"))
-
-    def test_has_os_interface_extension(self):
-        mock_extension = mock.Mock()
-        p = mock.PropertyMock(return_value='os-virtual-interfaces')
-        type(mock_extension).alias = p
-        self.nova_client.list_extensions.show_all.return_value = [
-            mock_extension]
-        self.assertTrue(self.nova_plugin.has_extension(
-            "os-virtual-interfaces"))
diff --git a/heat/tests/openstack/nova/fakes.py b/heat/tests/openstack/nova/fakes.py
index 2651a96dfb..4404ea7985 100644
--- a/heat/tests/openstack/nova/fakes.py
+++ b/heat/tests/openstack/nova/fakes.py
@@ -363,6 +363,19 @@ class FakeSessionClient(base_client.SessionClient):
             'id': 3, 'name': 'm1.large', 'ram': 512, 'disk': 20,
             'OS-FLV-EXT-DATA:ephemeral': 30}})
 
+    #
+    # Interfaces
+    #
+
+    def get_servers_5678_os_interface(self, **kw):
+        return (200, {'interfaceAttachments':
+                      [{"fixed_ips":
+                        [{"ip_address": "10.0.0.1",
+                          "subnet_id": "f8a6e8f8-c2ec-497c-9f23-da9616de54ef"
+                          }],
+                        "port_id": "ce531f90-199f-48c0-816c-13e38010b442"
+                        }]})
+
     #
     # Floating ips
     #
diff --git a/heat/tests/openstack/nova/test_flavor.py b/heat/tests/openstack/nova/test_flavor.py
index 7799fbdbb8..1f6afcfdfb 100644
--- a/heat/tests/openstack/nova/test_flavor.py
+++ b/heat/tests/openstack/nova/test_flavor.py
@@ -13,7 +13,6 @@
 
 import mock
 
-from heat.engine.clients.os import nova as novac
 from heat.engine import stack
 from heat.engine import template
 from heat.tests import common
@@ -42,8 +41,6 @@ flavor_template = {
 class NovaFlavorTest(common.HeatTestCase):
     def setUp(self):
         super(NovaFlavorTest, self).setUp()
-        self.patchobject(novac.NovaClientPlugin, 'has_extension',
-                         return_value=True)
         self.ctx = utils.dummy_context()
 
     def create_flavor(self, with_name_id=False, is_public=True):
diff --git a/heat/tests/openstack/nova/test_host_aggregate.py b/heat/tests/openstack/nova/test_host_aggregate.py
index 8b164e4e73..0c63fec18a 100644
--- a/heat/tests/openstack/nova/test_host_aggregate.py
+++ b/heat/tests/openstack/nova/test_host_aggregate.py
@@ -39,9 +39,6 @@ AGGREGATE_TEMPLATE = {
 class NovaHostAggregateTest(common.HeatTestCase):
     def setUp(self):
         super(NovaHostAggregateTest, self).setUp()
-        self.patchobject(nova.NovaClientPlugin,
-                         'has_extension',
-                         return_value=True)
         self.ctx = utils.dummy_context()
 
         self.stack = stack.Stack(
diff --git a/heat/tests/openstack/nova/test_keypair.py b/heat/tests/openstack/nova/test_keypair.py
index cc412bbd2d..1244bc4f30 100644
--- a/heat/tests/openstack/nova/test_keypair.py
+++ b/heat/tests/openstack/nova/test_keypair.py
@@ -46,8 +46,6 @@ class NovaKeyPairTest(common.HeatTestCase):
         self.fake_nova = mock.MagicMock()
         self.fake_keypairs = mock.MagicMock()
         self.fake_nova.keypairs = self.fake_keypairs
-        self.patchobject(nova.NovaClientPlugin, 'has_extension',
-                         return_value=True)
         self.cp_mock = self.patchobject(nova.NovaClientPlugin, 'client',
                                         return_value=self.fake_nova)
 
diff --git a/heat/tests/openstack/nova/test_quota.py b/heat/tests/openstack/nova/test_quota.py
index 3c813a56b9..648db38955 100644
--- a/heat/tests/openstack/nova/test_quota.py
+++ b/heat/tests/openstack/nova/test_quota.py
@@ -16,7 +16,6 @@ import six
 from heat.common import exception
 from heat.common import template_format
 from heat.engine.clients.os import keystone as k_plugin
-from heat.engine.clients.os import nova as n_plugin
 from heat.engine import rsrc_defn
 from heat.engine import stack as parser
 from heat.engine import template
@@ -62,8 +61,6 @@ class NovaQuotaTest(common.HeatTestCase):
         super(NovaQuotaTest, self).setUp()
 
         self.ctx = utils.dummy_context()
-        self.patchobject(n_plugin.NovaClientPlugin, 'has_extension',
-                         return_value=True)
         self.patchobject(k_plugin.KeystoneClientPlugin, 'get_project_id',
                          return_value='some_project_id')
         tpl = template_format.parse(quota_template)
diff --git a/heat/tests/openstack/nova/test_server.py b/heat/tests/openstack/nova/test_server.py
index 0f6858d0c9..8744466d73 100644
--- a/heat/tests/openstack/nova/test_server.py
+++ b/heat/tests/openstack/nova/test_server.py
@@ -1349,8 +1349,6 @@ class ServersTest(common.HeatTestCase):
   }
 }
 '''
-        self.patchobject(nova.NovaClientPlugin, 'has_extension',
-                         return_value=True)
         t = template_format.parse(nova_keypair_template)
         templ = template.Template(t)
         self.patchobject(nova.NovaClientPlugin, 'client',
@@ -4947,7 +4945,6 @@ class ServerInternalPortTest(ServersTest):
         server.client = mock.Mock()
         server.client().servers.get.return_value = Fake()
         server.client_plugin = mock.Mock()
-        server.client_plugin().has_extension.return_value = True
         server._data = {"internal_ports": '[{"id": "1122"}]',
                         "external_ports": '[{"id": "3344"},{"id": "5566"}]'}
 
@@ -5220,28 +5217,3 @@ class ServerInternalPortTest(ServersTest):
             mock.call('prev_rsrc', 1122),
             mock.call('prev_rsrc', 3344),
             mock.call('prev_rsrc', 5566)])
-
-    def test_store_external_ports_os_interface_not_installed(self):
-        t, stack, server = self._return_template_stack_and_rsrc_defn(
-            'test', tmpl_server_with_network_id)
-
-        class Fake(object):
-            def interface_list(self):
-                return [iface('1122'),
-                        iface('1122'),
-                        iface('2233'),
-                        iface('3344')]
-
-        server.client = mock.Mock()
-        server.client().servers.get.return_value = Fake()
-        server.client_plugin = mock.Mock()
-        server.client_plugin().has_extension.return_value = False
-
-        server._data = {"internal_ports": '[{"id": "1122"}]',
-                        "external_ports": '[{"id": "3344"},{"id": "5566"}]'}
-
-        iface = collections.namedtuple('iface', ['port_id'])
-        update_data = self.patchobject(server, '_data_update_ports')
-
-        server.store_external_ports()
-        self.assertEqual(0, update_data.call_count)
diff --git a/heat/tests/openstack/nova/test_server_group.py b/heat/tests/openstack/nova/test_server_group.py
index a8129fa9e0..6a2e8bed55 100644
--- a/heat/tests/openstack/nova/test_server_group.py
+++ b/heat/tests/openstack/nova/test_server_group.py
@@ -16,7 +16,6 @@ import json
 import mock
 
 from heat.common import template_format
-from heat.engine.clients.os import nova
 from heat.engine import scheduler
 from heat.tests import common
 from heat.tests import utils
@@ -44,8 +43,6 @@ class FakeGroup(object):
 class NovaServerGroupTest(common.HeatTestCase):
     def setUp(self):
         super(NovaServerGroupTest, self).setUp()
-        self.patchobject(nova.NovaClientPlugin, 'has_extension',
-                         return_value=True)
 
     def _init_template(self, sg_template):
         template = template_format.parse(json.dumps(sg_template))
diff --git a/releasenotes/notes/remove-nova-api-extension-934f8389ea42e9e4.yaml b/releasenotes/notes/remove-nova-api-extension-934f8389ea42e9e4.yaml
new file mode 100644
index 0000000000..609edc4ea0
--- /dev/null
+++ b/releasenotes/notes/remove-nova-api-extension-934f8389ea42e9e4.yaml
@@ -0,0 +1,6 @@
+---
+upgrade:
+  - |
+    Nova has removed api extension support and its api bindings.
+    Heat has now removed support for extensions from nova client
+    plugin and the resource plugins using it.