diff --git a/neutron/hacking/checks.py b/neutron/hacking/checks.py
index 2d221523ab0..eea4d97961e 100644
--- a/neutron/hacking/checks.py
+++ b/neutron/hacking/checks.py
@@ -47,6 +47,8 @@ tests_imports_dot = re.compile(r"\bimport[\s]+neutron.tests\b")
 tests_imports_from1 = re.compile(r"\bfrom[\s]+neutron.tests\b")
 tests_imports_from2 = re.compile(r"\bfrom[\s]+neutron[\s]+import[\s]+tests\b")
 
+import_mock = re.compile(r"\bimport[\s]+mock\b")
+
 
 @flake8ext
 def check_assert_called_once_with(logical_line, filename):
@@ -202,9 +204,9 @@ def check_builtins_gettext(logical_line, tokens, filename, lines, noqa):
 
 @flake8ext
 def check_no_imports_from_tests(logical_line, filename, noqa):
-    """N343 Production code must not import from neutron.tests.*
+    """N343 - Production code must not import from neutron.tests.*
     """
-    msg = ("N343 Production code must not import from neutron.tests.*")
+    msg = ("N343: Production code must not import from neutron.tests.*")
 
     if noqa:
         return
@@ -246,6 +248,22 @@ def check_no_sqlalchemy_event_import(logical_line, filename, noqa):
               "between unit tests")
 
 
+@flake8ext
+def check_no_import_mock(logical_line, filename, noqa):
+    """N347 - Test code must not import mock library
+    """
+    msg = ("N347: Test code must not import mock library")
+
+    if noqa:
+        return
+
+    if 'neutron/tests/' not in filename:
+        return
+
+    if re.match(import_mock, logical_line):
+        yield(0, msg)
+
+
 def factory(register):
     checks.factory(register)
     register(check_assert_called_once_with)
@@ -258,3 +276,4 @@ def factory(register):
     register(check_no_imports_from_tests)
     register(check_python3_no_filter)
     register(check_no_sqlalchemy_event_import)
+    register(check_no_import_mock)
diff --git a/neutron/tests/base.py b/neutron/tests/base.py
index edc10d1bb4b..d223de5d500 100644
--- a/neutron/tests/base.py
+++ b/neutron/tests/base.py
@@ -24,10 +24,10 @@ import logging
 import os
 import os.path
 import threading
+from unittest import mock
 
 import eventlet.timeout
 import fixtures
-import mock
 from neutron_lib.callbacks import manager as registry_manager
 from neutron_lib.db import api as db_api
 from neutron_lib import fixture
diff --git a/neutron/tests/common/agents/l3_agent.py b/neutron/tests/common/agents/l3_agent.py
index d22060ca75a..3281982cb0f 100755
--- a/neutron/tests/common/agents/l3_agent.py
+++ b/neutron/tests/common/agents/l3_agent.py
@@ -14,8 +14,8 @@
 
 import sys
 import types
+from unittest import mock
 
-import mock
 from neutron_lib import constants
 from oslo_config import cfg
 
diff --git a/neutron/tests/fullstack/agents/ovs_agent.py b/neutron/tests/fullstack/agents/ovs_agent.py
index a4c7801f562..926fa911046 100755
--- a/neutron/tests/fullstack/agents/ovs_agent.py
+++ b/neutron/tests/fullstack/agents/ovs_agent.py
@@ -14,8 +14,8 @@
 #    under the License.
 
 import sys
+from unittest import mock
 
-import mock
 from oslo_config import cfg
 
 from neutron.agent.common import ovs_lib
diff --git a/neutron/tests/functional/agent/common/test_ovs_lib.py b/neutron/tests/functional/agent/common/test_ovs_lib.py
index 02de426e31f..e6cd6bd3714 100644
--- a/neutron/tests/functional/agent/common/test_ovs_lib.py
+++ b/neutron/tests/functional/agent/common/test_ovs_lib.py
@@ -14,8 +14,8 @@
 #    under the License.
 
 import functools
+from unittest import mock
 
-import mock
 from neutron_lib.services.qos import constants as qos_constants
 from oslo_utils import uuidutils
 import six
diff --git a/neutron/tests/functional/agent/l2/base.py b/neutron/tests/functional/agent/l2/base.py
index 237580a33f2..ef4d6906f6a 100644
--- a/neutron/tests/functional/agent/l2/base.py
+++ b/neutron/tests/functional/agent/l2/base.py
@@ -15,10 +15,10 @@
 #    under the License.
 
 import random
+from unittest import mock
 
 import eventlet
 import fixtures
-import mock
 from neutron_lib import constants as n_const
 from neutron_lib.utils import net
 from oslo_config import cfg
diff --git a/neutron/tests/functional/agent/l2/extensions/test_ovs_agent_qos_extension.py b/neutron/tests/functional/agent/l2/extensions/test_ovs_agent_qos_extension.py
index 72981c0c85c..2e506b89f45 100644
--- a/neutron/tests/functional/agent/l2/extensions/test_ovs_agent_qos_extension.py
+++ b/neutron/tests/functional/agent/l2/extensions/test_ovs_agent_qos_extension.py
@@ -14,8 +14,8 @@
 #    under the License.
 
 import copy
+from unittest import mock
 
-import mock
 from neutron_lib import constants
 from oslo_utils import uuidutils
 import testscenarios
diff --git a/neutron/tests/functional/agent/l3/extensions/qos/test_fip_qos_extension.py b/neutron/tests/functional/agent/l3/extensions/qos/test_fip_qos_extension.py
index 0a3f695678f..d94b05aa5cf 100644
--- a/neutron/tests/functional/agent/l3/extensions/qos/test_fip_qos_extension.py
+++ b/neutron/tests/functional/agent/l3/extensions/qos/test_fip_qos_extension.py
@@ -13,7 +13,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import mock
+from unittest import mock
+
 from neutron_lib import constants
 from neutron_lib import exceptions
 from oslo_utils import uuidutils
diff --git a/neutron/tests/functional/agent/l3/extensions/test_conntrack_helper_extension.py b/neutron/tests/functional/agent/l3/extensions/test_conntrack_helper_extension.py
index a96cc3b6fce..6e84f9e239b 100644
--- a/neutron/tests/functional/agent/l3/extensions/test_conntrack_helper_extension.py
+++ b/neutron/tests/functional/agent/l3/extensions/test_conntrack_helper_extension.py
@@ -15,8 +15,7 @@
 
 
 import collections
-
-import mock
+from unittest import mock
 
 from neutron_lib import constants
 from oslo_utils import uuidutils
diff --git a/neutron/tests/functional/agent/l3/extensions/test_gateway_ip_qos_extension.py b/neutron/tests/functional/agent/l3/extensions/test_gateway_ip_qos_extension.py
index 7c551a93e32..c9df3fe006c 100644
--- a/neutron/tests/functional/agent/l3/extensions/test_gateway_ip_qos_extension.py
+++ b/neutron/tests/functional/agent/l3/extensions/test_gateway_ip_qos_extension.py
@@ -13,7 +13,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import mock
+from unittest import mock
+
 from neutron_lib import constants
 from neutron_lib import exceptions
 from oslo_utils import uuidutils
diff --git a/neutron/tests/functional/agent/l3/extensions/test_port_forwarding_extension.py b/neutron/tests/functional/agent/l3/extensions/test_port_forwarding_extension.py
index 78d916f2488..9cc216221aa 100644
--- a/neutron/tests/functional/agent/l3/extensions/test_port_forwarding_extension.py
+++ b/neutron/tests/functional/agent/l3/extensions/test_port_forwarding_extension.py
@@ -15,11 +15,11 @@
 
 import os
 import re
+from unittest import mock
 
 from neutron_lib import constants
 from oslo_utils import uuidutils
 
-import mock
 from neutron.agent.l3 import agent as neutron_l3_agent
 from neutron.agent.l3.extensions import port_forwarding as pf
 from neutron.agent.linux import ip_lib
diff --git a/neutron/tests/functional/agent/l3/framework.py b/neutron/tests/functional/agent/l3/framework.py
index 25506d25011..00deb8fb020 100644
--- a/neutron/tests/functional/agent/l3/framework.py
+++ b/neutron/tests/functional/agent/l3/framework.py
@@ -15,8 +15,8 @@
 
 import copy
 import functools
+from unittest import mock
 
-import mock
 import netaddr
 from neutron_lib import constants
 from oslo_config import cfg
diff --git a/neutron/tests/functional/agent/l3/test_dvr_router.py b/neutron/tests/functional/agent/l3/test_dvr_router.py
index 61b9546e97f..1cb0ec905bf 100644
--- a/neutron/tests/functional/agent/l3/test_dvr_router.py
+++ b/neutron/tests/functional/agent/l3/test_dvr_router.py
@@ -15,8 +15,8 @@
 
 import copy
 import functools
+from unittest import mock
 
-import mock
 import netaddr
 from neutron_lib.api.definitions import portbindings
 from neutron_lib import constants as lib_constants
diff --git a/neutron/tests/functional/agent/l3/test_ha_router.py b/neutron/tests/functional/agent/l3/test_ha_router.py
index bb545523357..e547f86b66e 100644
--- a/neutron/tests/functional/agent/l3/test_ha_router.py
+++ b/neutron/tests/functional/agent/l3/test_ha_router.py
@@ -14,8 +14,8 @@
 #    under the License.
 
 import copy
+from unittest import mock
 
-import mock
 from neutron_lib import constants
 from oslo_utils import netutils
 import testtools
diff --git a/neutron/tests/functional/agent/l3/test_keepalived_state_change.py b/neutron/tests/functional/agent/l3/test_keepalived_state_change.py
index 87d25f26e00..f19c799b51a 100644
--- a/neutron/tests/functional/agent/l3/test_keepalived_state_change.py
+++ b/neutron/tests/functional/agent/l3/test_keepalived_state_change.py
@@ -14,9 +14,9 @@
 
 import functools
 import os
+from unittest import mock
 
 import eventlet
-import mock
 import netaddr
 from oslo_utils import uuidutils
 
diff --git a/neutron/tests/functional/agent/l3/test_legacy_router.py b/neutron/tests/functional/agent/l3/test_legacy_router.py
index ec86e83753e..e27bbeaee03 100644
--- a/neutron/tests/functional/agent/l3/test_legacy_router.py
+++ b/neutron/tests/functional/agent/l3/test_legacy_router.py
@@ -14,8 +14,8 @@
 #    under the License.
 
 import copy
+from unittest import mock
 
-import mock
 from neutron_lib.callbacks import events
 from neutron_lib.callbacks import registry
 from neutron_lib.callbacks import resources
diff --git a/neutron/tests/functional/agent/l3/test_namespace_manager.py b/neutron/tests/functional/agent/l3/test_namespace_manager.py
index b68d0fe5288..8c996164400 100644
--- a/neutron/tests/functional/agent/l3/test_namespace_manager.py
+++ b/neutron/tests/functional/agent/l3/test_namespace_manager.py
@@ -13,7 +13,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import mock
+from unittest import mock
+
 from oslo_config import cfg
 from oslo_utils import uuidutils
 
diff --git a/neutron/tests/functional/agent/linux/test_dhcp.py b/neutron/tests/functional/agent/linux/test_dhcp.py
index fc559bdd29c..cdd7c11265e 100644
--- a/neutron/tests/functional/agent/linux/test_dhcp.py
+++ b/neutron/tests/functional/agent/linux/test_dhcp.py
@@ -12,7 +12,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import mock
+from unittest import mock
+
 from neutron_lib import constants
 from oslo_config import cfg
 
diff --git a/neutron/tests/functional/agent/linux/test_l3_tc_lib.py b/neutron/tests/functional/agent/linux/test_l3_tc_lib.py
index fd1142d76a2..2b22d1bd9ff 100644
--- a/neutron/tests/functional/agent/linux/test_l3_tc_lib.py
+++ b/neutron/tests/functional/agent/linux/test_l3_tc_lib.py
@@ -10,7 +10,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import mock
+from unittest import mock
+
 from neutron_lib import constants as common_constants
 from neutron_lib import exceptions
 from oslo_utils import uuidutils
diff --git a/neutron/tests/functional/agent/linux/test_tc_lib.py b/neutron/tests/functional/agent/linux/test_tc_lib.py
index e4e882cd179..f0211b145c7 100644
--- a/neutron/tests/functional/agent/linux/test_tc_lib.py
+++ b/neutron/tests/functional/agent/linux/test_tc_lib.py
@@ -14,8 +14,8 @@
 #    under the License.
 
 import random
+from unittest import mock
 
-import mock
 import netaddr
 from neutron_lib.services.qos import constants as qos_consts
 from oslo_utils import uuidutils
diff --git a/neutron/tests/functional/agent/ovn/metadata/test_metadata_agent.py b/neutron/tests/functional/agent/ovn/metadata/test_metadata_agent.py
index 04cb9975a4b..311101fb6a2 100644
--- a/neutron/tests/functional/agent/ovn/metadata/test_metadata_agent.py
+++ b/neutron/tests/functional/agent/ovn/metadata/test_metadata_agent.py
@@ -13,7 +13,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import mock
+from unittest import mock
+
 from oslo_config import fixture as fixture_config
 from oslo_utils import uuidutils
 from ovsdbapp.backend.ovs_idl import event
diff --git a/neutron/tests/functional/agent/test_dhcp_agent.py b/neutron/tests/functional/agent/test_dhcp_agent.py
index 88a5797f427..ca1354cbd00 100644
--- a/neutron/tests/functional/agent/test_dhcp_agent.py
+++ b/neutron/tests/functional/agent/test_dhcp_agent.py
@@ -15,10 +15,10 @@
 
 import copy
 import os.path
+from unittest import mock
 
 import eventlet
 import fixtures
-import mock
 import netaddr
 from neutron_lib import constants as lib_const
 from oslo_config import fixture as fixture_config
diff --git a/neutron/tests/functional/agent/test_l2_lb_agent.py b/neutron/tests/functional/agent/test_l2_lb_agent.py
index 08ffb3662c8..55e658608cd 100644
--- a/neutron/tests/functional/agent/test_l2_lb_agent.py
+++ b/neutron/tests/functional/agent/test_l2_lb_agent.py
@@ -12,7 +12,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import mock
+from unittest import mock
+
 from oslo_config import cfg
 from oslo_utils import uuidutils
 import testtools
diff --git a/neutron/tests/functional/agent/test_l2_ovs_agent.py b/neutron/tests/functional/agent/test_l2_ovs_agent.py
index 0aabb585a31..391b622c97f 100644
--- a/neutron/tests/functional/agent/test_l2_ovs_agent.py
+++ b/neutron/tests/functional/agent/test_l2_ovs_agent.py
@@ -15,8 +15,8 @@
 #    under the License.
 
 import time
+from unittest import mock
 
-import mock
 from neutron_lib.callbacks import events
 from neutron_lib.callbacks import registry
 from neutron_lib.callbacks import resources
diff --git a/neutron/tests/functional/agent/test_ovs_lib.py b/neutron/tests/functional/agent/test_ovs_lib.py
index d85cdce167e..e8fc75e2dcd 100644
--- a/neutron/tests/functional/agent/test_ovs_lib.py
+++ b/neutron/tests/functional/agent/test_ovs_lib.py
@@ -14,9 +14,9 @@
 #    under the License.
 
 import collections
+from unittest import mock
 import uuid
 
-import mock
 from neutron_lib import constants as const
 from oslo_config import cfg
 from ovsdbapp.backend.ovs_idl import idlutils
diff --git a/neutron/tests/functional/base.py b/neutron/tests/functional/base.py
index f1731a1a3b2..ac1c2e81b53 100644
--- a/neutron/tests/functional/base.py
+++ b/neutron/tests/functional/base.py
@@ -17,10 +17,10 @@ from datetime import datetime
 import errno
 import os
 import shutil
+from unittest import mock
 import warnings
 
 import fixtures
-import mock
 from neutron_lib import fixture
 from neutron_lib.plugins import constants
 from neutron_lib.plugins import directory
diff --git a/neutron/tests/functional/cmd/test_linuxbridge_cleanup.py b/neutron/tests/functional/cmd/test_linuxbridge_cleanup.py
index 06d195c1d45..c9ebeddd74f 100644
--- a/neutron/tests/functional/cmd/test_linuxbridge_cleanup.py
+++ b/neutron/tests/functional/cmd/test_linuxbridge_cleanup.py
@@ -13,8 +13,9 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from unittest import mock
+
 import fixtures
-import mock
 from neutron_lib import constants
 
 from neutron.agent.linux import ip_lib
diff --git a/neutron/tests/functional/cmd/test_netns_cleanup.py b/neutron/tests/functional/cmd/test_netns_cleanup.py
index 9026e60bb5e..a7019ecd66d 100644
--- a/neutron/tests/functional/cmd/test_netns_cleanup.py
+++ b/neutron/tests/functional/cmd/test_netns_cleanup.py
@@ -15,9 +15,9 @@
 
 import os
 import sys
+from unittest import mock
 
 import eventlet
-import mock
 from neutron_lib import constants as n_const
 
 from neutron.agent.l3 import namespaces
diff --git a/neutron/tests/functional/db/test_network.py b/neutron/tests/functional/db/test_network.py
index 6532d78c503..2160a344bc2 100644
--- a/neutron/tests/functional/db/test_network.py
+++ b/neutron/tests/functional/db/test_network.py
@@ -10,7 +10,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import mock
+from unittest import mock
+
 from neutron_lib.api.definitions import external_net as extnet_apidef
 from neutron_lib import constants
 from neutron_lib import context
diff --git a/neutron/tests/functional/pecan_wsgi/test_controllers.py b/neutron/tests/functional/pecan_wsgi/test_controllers.py
index 10bf9532dd4..c77e6c870d8 100644
--- a/neutron/tests/functional/pecan_wsgi/test_controllers.py
+++ b/neutron/tests/functional/pecan_wsgi/test_controllers.py
@@ -10,7 +10,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import mock
+from unittest import mock
+
 from neutron_lib import constants as n_const
 from neutron_lib import context
 from neutron_lib.plugins import constants as plugin_constants
diff --git a/neutron/tests/functional/pecan_wsgi/test_functional.py b/neutron/tests/functional/pecan_wsgi/test_functional.py
index ccd3623b70a..f5b5c7eb331 100644
--- a/neutron/tests/functional/pecan_wsgi/test_functional.py
+++ b/neutron/tests/functional/pecan_wsgi/test_functional.py
@@ -14,8 +14,8 @@
 #    under the License.
 
 import os
+from unittest import mock
 
-import mock
 from neutron_lib import context
 from neutron_lib import exceptions as n_exc
 from neutron_lib.plugins import constants
diff --git a/neutron/tests/functional/pecan_wsgi/test_hooks.py b/neutron/tests/functional/pecan_wsgi/test_hooks.py
index e1ba0ac6c3e..582b48a1656 100644
--- a/neutron/tests/functional/pecan_wsgi/test_hooks.py
+++ b/neutron/tests/functional/pecan_wsgi/test_hooks.py
@@ -13,7 +13,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import mock
+from unittest import mock
+
 from neutron_lib.api import attributes
 from neutron_lib.callbacks import events
 from neutron_lib import context
diff --git a/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/ovsdb/extensions/test_qos.py b/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/ovsdb/extensions/test_qos.py
index 2c5961253a9..32a159ca92e 100644
--- a/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/ovsdb/extensions/test_qos.py
+++ b/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/ovsdb/extensions/test_qos.py
@@ -12,7 +12,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import mock
+from unittest import mock
+
 from neutron_lib import constants
 from neutron_lib.services.qos import constants as qos_constants
 
diff --git a/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_maintenance.py b/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_maintenance.py
index 3bace092ca6..4b2541ee907 100644
--- a/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_maintenance.py
+++ b/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_maintenance.py
@@ -13,7 +13,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import mock
+from unittest import mock
+
 from oslo_config import cfg
 
 from futurist import periodics
diff --git a/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_ovn_db_resources.py b/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_ovn_db_resources.py
index be448bf1452..746fd7df09e 100644
--- a/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_ovn_db_resources.py
+++ b/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_ovn_db_resources.py
@@ -12,8 +12,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-
-import mock
+from unittest import mock
 
 import netaddr
 from neutron_lib.api.definitions import dns as dns_apidef
diff --git a/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_ovn_db_sync.py b/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_ovn_db_sync.py
index d7cd29b6a1f..6a95fc096d1 100644
--- a/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_ovn_db_sync.py
+++ b/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_ovn_db_sync.py
@@ -12,7 +12,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import mock
+from unittest import mock
 
 from neutron.common.ovn import acl as acl_utils
 from neutron.common.ovn import constants as ovn_const
diff --git a/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_ovsdb_monitor.py b/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_ovsdb_monitor.py
index 7e7eda060e5..4f1296faaf1 100644
--- a/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_ovsdb_monitor.py
+++ b/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/ovsdb/test_ovsdb_monitor.py
@@ -12,7 +12,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import mock
+from unittest import mock
+
 from oslo_utils import uuidutils
 
 from neutron.common.ovn import constants as ovn_const
diff --git a/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/test_mech_driver.py b/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/test_mech_driver.py
index c70a10dd922..210de740e1a 100644
--- a/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/test_mech_driver.py
+++ b/neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/test_mech_driver.py
@@ -13,8 +13,8 @@
 #    under the License.
 
 import functools
+from unittest import mock
 
-import mock
 from neutron_lib.api.definitions import portbindings
 from oslo_config import cfg
 from oslo_utils import uuidutils
diff --git a/neutron/tests/functional/services/conntrack_helper/test_conntrack_helper.py b/neutron/tests/functional/services/conntrack_helper/test_conntrack_helper.py
index 5124d5e925d..e57f0dd15d1 100644
--- a/neutron/tests/functional/services/conntrack_helper/test_conntrack_helper.py
+++ b/neutron/tests/functional/services/conntrack_helper/test_conntrack_helper.py
@@ -12,7 +12,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import mock
+from unittest import mock
 
 from neutron_lib.api.definitions import l3_conntrack_helper as apidef
 from neutron_lib import exceptions as lib_exc
diff --git a/neutron/tests/functional/services/l3_router/test_l3_dvr_ha_router_plugin.py b/neutron/tests/functional/services/l3_router/test_l3_dvr_ha_router_plugin.py
index cb1449072d7..19eedb7610d 100644
--- a/neutron/tests/functional/services/l3_router/test_l3_dvr_ha_router_plugin.py
+++ b/neutron/tests/functional/services/l3_router/test_l3_dvr_ha_router_plugin.py
@@ -12,7 +12,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import mock
+from unittest import mock
+
 from neutron_lib.agent import topics
 from neutron_lib.api.definitions import external_net as extnet_apidef
 from neutron_lib.api.definitions import l3 as l3_apidef
diff --git a/neutron/tests/functional/services/l3_router/test_l3_dvr_router_plugin.py b/neutron/tests/functional/services/l3_router/test_l3_dvr_router_plugin.py
index 96d144b910f..e823b98836e 100644
--- a/neutron/tests/functional/services/l3_router/test_l3_dvr_router_plugin.py
+++ b/neutron/tests/functional/services/l3_router/test_l3_dvr_router_plugin.py
@@ -12,7 +12,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import mock
+from unittest import mock
+
 from neutron_lib.agent import topics
 from neutron_lib.api.definitions import external_net as extnet_apidef
 from neutron_lib.api.definitions import l3 as l3_apidef
diff --git a/neutron/tests/functional/services/logapi/test_logging.py b/neutron/tests/functional/services/logapi/test_logging.py
index 887620cb96f..0a31b973386 100644
--- a/neutron/tests/functional/services/logapi/test_logging.py
+++ b/neutron/tests/functional/services/logapi/test_logging.py
@@ -14,8 +14,8 @@
 #    under the License.
 
 import re
+from unittest import mock
 
-import mock
 from neutron_lib import constants
 from neutron_lib import context as neutron_context
 from oslo_config import cfg
diff --git a/neutron/tests/functional/services/ovn_l3/test_plugin.py b/neutron/tests/functional/services/ovn_l3/test_plugin.py
index 780800f97d5..93d07e21b5e 100644
--- a/neutron/tests/functional/services/ovn_l3/test_plugin.py
+++ b/neutron/tests/functional/services/ovn_l3/test_plugin.py
@@ -12,7 +12,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import mock
+from unittest import mock
 
 from neutron.common.ovn import constants as ovn_const
 from neutron.common.ovn import utils as ovn_utils
diff --git a/neutron/tests/functional/services/portforwarding/test_port_forwarding.py b/neutron/tests/functional/services/portforwarding/test_port_forwarding.py
index 29a944a86d2..d8b45412451 100644
--- a/neutron/tests/functional/services/portforwarding/test_port_forwarding.py
+++ b/neutron/tests/functional/services/portforwarding/test_port_forwarding.py
@@ -10,7 +10,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import mock
+from unittest import mock
+
 from neutron_lib.api.definitions import fip_pf_description as ext_apidef
 from neutron_lib.api.definitions import floating_ip_port_forwarding as apidef
 from neutron_lib.callbacks import exceptions as c_exc
diff --git a/neutron/tests/functional/services/trunk/drivers/openvswitch/agent/test_ovsdb_handler.py b/neutron/tests/functional/services/trunk/drivers/openvswitch/agent/test_ovsdb_handler.py
index bed29e47ab0..2e5edea593d 100644
--- a/neutron/tests/functional/services/trunk/drivers/openvswitch/agent/test_ovsdb_handler.py
+++ b/neutron/tests/functional/services/trunk/drivers/openvswitch/agent/test_ovsdb_handler.py
@@ -13,7 +13,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import mock
+from unittest import mock
 
 from neutron_lib import constants as n_consts
 from neutron_lib.utils import helpers
diff --git a/neutron/tests/functional/services/trunk/drivers/openvswitch/agent/test_trunk_manager.py b/neutron/tests/functional/services/trunk/drivers/openvswitch/agent/test_trunk_manager.py
index 08db9a7d7f8..3842739644e 100644
--- a/neutron/tests/functional/services/trunk/drivers/openvswitch/agent/test_trunk_manager.py
+++ b/neutron/tests/functional/services/trunk/drivers/openvswitch/agent/test_trunk_manager.py
@@ -13,7 +13,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import mock
+from unittest import mock
 
 from neutron_lib.utils import net
 from oslo_log import log as logging
diff --git a/neutron/tests/functional/services/trunk/rpc/test_server.py b/neutron/tests/functional/services/trunk/rpc/test_server.py
index 0af3afa0365..40ae1cae703 100644
--- a/neutron/tests/functional/services/trunk/rpc/test_server.py
+++ b/neutron/tests/functional/services/trunk/rpc/test_server.py
@@ -12,7 +12,7 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-import mock
+from unittest import mock
 
 from neutron_lib.services.trunk import constants
 
diff --git a/neutron/tests/functional/test_server.py b/neutron/tests/functional/test_server.py
index 01377d3b73e..29cc761d552 100644
--- a/neutron/tests/functional/test_server.py
+++ b/neutron/tests/functional/test_server.py
@@ -18,9 +18,9 @@ import signal
 import socket
 import time
 import traceback
+from unittest import mock
 
 import httplib2
-import mock
 from neutron_lib import worker as neutron_worker
 from oslo_config import cfg
 import psutil
diff --git a/neutron/tests/functional/tests/common/test_net_helpers.py b/neutron/tests/functional/tests/common/test_net_helpers.py
index 0be627cb6ac..e5e4ec44644 100644
--- a/neutron/tests/functional/tests/common/test_net_helpers.py
+++ b/neutron/tests/functional/tests/common/test_net_helpers.py
@@ -13,8 +13,7 @@
 #    under the License.
 
 import signal
-
-import mock
+from unittest import mock
 
 from neutron_lib import exceptions as n_exc
 
diff --git a/neutron/tests/unit/hacking/test_checks.py b/neutron/tests/unit/hacking/test_checks.py
index 18e5b4773a1..82943068d5d 100644
--- a/neutron/tests/unit/hacking/test_checks.py
+++ b/neutron/tests/unit/hacking/test_checks.py
@@ -208,6 +208,24 @@ class HackingTestCase(base.BaseTestCase):
         self.assertLinePasses(f, "filter(function, range(0,10))")
         self.assertLinePasses(f, "lambda x, y: x+y")
 
+    def test_check_no_import_mock(self):
+        pass_line = 'from unittest import mock'
+        fail_lines = ('import mock',
+                      'import mock as mock_lib')
+        self.assertEqual(
+            0, len(list(
+                checks.check_no_import_mock(
+                    pass_line, "neutron/tests/test_fake.py", None))))
+        for fail_line in fail_lines:
+            self.assertEqual(
+                0, len(list(
+                    checks.check_no_import_mock(
+                        fail_line, "neutron/common/utils.py", None))))
+            self.assertEqual(
+                1, len(list(
+                    checks.check_no_import_mock(
+                        fail_line, "neutron/tests/test_fake.py", None))))
+
 
 # The following is borrowed from hacking/tests/test_doctest.py.
 # Tests defined in docstring is easier to understand
diff --git a/test-requirements.txt b/test-requirements.txt
index 43d563a78f1..b3101e6ebfa 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -7,7 +7,6 @@ coverage!=4.4,>=4.0 # Apache-2.0
 fixtures>=3.0.0 # Apache-2.0/BSD
 flake8-import-order==0.12 # LGPLv3
 pycodestyle>=2.0.0 # MIT
-mock>=3.0.0 # BSD
 python-subunit>=1.0.0 # Apache-2.0/BSD
 testtools>=2.2.0 # MIT
 testresources>=2.0.0 # Apache-2.0/BSD