diff --git a/doc/source/cli/command-objects/port.rst b/doc/source/cli/command-objects/port.rst
index f8e88230f..335c22707 100644
--- a/doc/source/cli/command-objects/port.rst
+++ b/doc/source/cli/command-objects/port.rst
@@ -28,6 +28,7 @@ Create new port
         [--enable | --disable]
         [--mac-address <mac-address>]
         [--security-group <security-group> | --no-security-group]
+        [--dns-domain <dns-domain>]
         [--dns-name <dns-name>]
         [--allowed-address ip-address=<ip-address>[,mac-address=<mac-address>]]
         [--qos-policy <qos-policy>]
@@ -99,9 +100,14 @@ Create new port
 
     Associate no security groups with this port
 
+.. option:: --dns-domain <dns-name>
+
+    Set DNS domain for this port
+    (requires dns_domain for ports extension)
+
 .. option:: --dns-name <dns-name>
 
-    Set DNS name to this port
+    Set DNS name for this port
     (requires DNS integration extension)
 
 .. option:: --allowed-address ip-address=<ip-address>[,mac-address=<mac-address>]
@@ -264,6 +270,7 @@ Set port properties
         [--security-group <security-group>]
         [--no-security-group]
         [--enable-port-security | --disable-port-security]
+        [--dns-domain <dns-domain>]
         [--dns-name <dns-name>]
         [--allowed-address ip-address=<ip-address>[,mac-address=<mac-address>]]
         [--no-allowed-address]
@@ -354,9 +361,14 @@ Set port properties
 
     Disable port security for this port
 
+.. option:: --dns-domain <dns-domain>
+
+    Set DNS domain for this port
+    (requires dns_domain for ports extension)
+
 .. option:: --dns-name <dns-name>
 
-    Set DNS name to this port
+    Set DNS name for this port
     (requires DNS integration extension)
 
 .. option:: --allowed-address ip-address=<ip-address>[,mac-address=<mac-address>]
diff --git a/openstackclient/network/v2/port.py b/openstackclient/network/v2/port.py
index 032e17874..f13ee7b90 100644
--- a/openstackclient/network/v2/port.py
+++ b/openstackclient/network/v2/port.py
@@ -127,6 +127,8 @@ def _get_attrs(client_manager, parsed_args):
     if parsed_args.mac_address is not None:
         attrs['mac_address'] = parsed_args.mac_address
 
+    if parsed_args.dns_domain is not None:
+        attrs['dns_domain'] = parsed_args.dns_domain
     if parsed_args.dns_name is not None:
         attrs['dns_name'] = parsed_args.dns_name
     # It is possible that name is not updated during 'port set'
@@ -268,6 +270,12 @@ def _add_updatable_args(parser):
         metavar='<host-id>',
         help=argparse.SUPPRESS,
     )
+    parser.add_argument(
+        '--dns-domain',
+        metavar='dns-domain',
+        help=_("Set DNS domain to this port "
+               "(requires dns_domain extension for ports)")
+    )
     parser.add_argument(
         '--dns-name',
         metavar='dns-name',
diff --git a/openstackclient/tests/unit/network/v2/fakes.py b/openstackclient/tests/unit/network/v2/fakes.py
index a77cab8b5..4291dd1d6 100644
--- a/openstackclient/tests/unit/network/v2/fakes.py
+++ b/openstackclient/tests/unit/network/v2/fakes.py
@@ -565,6 +565,7 @@ class FakePort(object):
             'device_id': 'device-id-' + uuid.uuid4().hex,
             'device_owner': 'compute:nova',
             'dns_assignment': [{}],
+            'dns_domain': 'dns-domain-' + uuid.uuid4().hex,
             'dns_name': 'dns-name-' + uuid.uuid4().hex,
             'extra_dhcp_opts': [{}],
             'fixed_ips': [{'ip_address': '10.0.0.3',
diff --git a/openstackclient/tests/unit/network/v2/test_port.py b/openstackclient/tests/unit/network/v2/test_port.py
index 908177ce6..03e1d841b 100644
--- a/openstackclient/tests/unit/network/v2/test_port.py
+++ b/openstackclient/tests/unit/network/v2/test_port.py
@@ -50,6 +50,7 @@ class TestPort(network_fakes.TestNetworkV2):
             'device_id',
             'device_owner',
             'dns_assignment',
+            'dns_domain',
             'dns_name',
             'extra_dhcp_opts',
             'fixed_ips',
@@ -78,6 +79,7 @@ class TestPort(network_fakes.TestNetworkV2):
             fake_port.device_id,
             fake_port.device_owner,
             utils.format_list_of_dicts(fake_port.dns_assignment),
+            fake_port.dns_domain,
             fake_port.dns_name,
             utils.format_list_of_dicts(fake_port.extra_dhcp_opts),
             utils.format_list_of_dicts(fake_port.fixed_ips),
@@ -152,6 +154,7 @@ class TestCreatePort(TestPort):
             '--binding-profile', 'foo=bar',
             '--binding-profile', 'foo2=bar2',
             '--network', self._port.network_id,
+            '--dns-domain', 'example.org',
             '--dns-name', '8.8.8.8',
             'test-port',
 
@@ -169,6 +172,7 @@ class TestCreatePort(TestPort):
             ('vnic_type', 'macvtap'),
             ('binding_profile', {'foo': 'bar', 'foo2': 'bar2'}),
             ('network', self._port.network_id),
+            ('dns_domain', 'example.org'),
             ('dns_name', '8.8.8.8'),
             ('name', 'test-port'),
         ]
@@ -187,6 +191,7 @@ class TestCreatePort(TestPort):
             'binding:vnic_type': 'macvtap',
             'binding:profile': {'foo': 'bar', 'foo2': 'bar2'},
             'network_id': self._port.network_id,
+            'dns_domain': 'example.org',
             'dns_name': '8.8.8.8',
             'name': 'test-port',
         })
diff --git a/releasenotes/notes/bug-1714878-46806jv2yv13q054.yaml b/releasenotes/notes/bug-1714878-46806jv2yv13q054.yaml
new file mode 100644
index 000000000..a2f376b8c
--- /dev/null
+++ b/releasenotes/notes/bug-1714878-46806jv2yv13q054.yaml
@@ -0,0 +1,8 @@
+---
+features:
+  - |
+    Add ``--dns-domain`` option to ``port create`` and ``port set`` commands.
+    Requires the ``dns_domain for ports`` extension to be enabled. See the
+    `Neutron DNS integration <https://docs.openstack.org/neutron/latest/admin/config-dns-int.html>`_
+    documentation for information how to use this.
+    [Bug `1714878 <https://bugs.launchpad.net/python-openstackclient/+bug/1714878>`_]