diff --git a/api-ref/source/v2/parameters.yaml b/api-ref/source/v2/parameters.yaml
index 52f484d4d..26c3fa74e 100644
--- a/api-ref/source/v2/parameters.yaml
+++ b/api-ref/source/v2/parameters.yaml
@@ -5054,6 +5054,12 @@ qos_minimum_bandwidth_rule-id:
   in: body
   required: true
   type: string
+qos_network_policy_id-port-response:
+  description: |
+    The ID of the QoS policy of the network where this port is plugged.
+  in: body
+  required: true
+  type: string
 qos_policy-name:
   description: |
       Human-readable name of the resource.
diff --git a/api-ref/source/v2/ports.inc b/api-ref/source/v2/ports.inc
index 260f22a83..c80b75cb5 100644
--- a/api-ref/source/v2/ports.inc
+++ b/api-ref/source/v2/ports.inc
@@ -117,6 +117,13 @@ define QoS policies and associate these to the ports by introducing the
 ``qos_policy_id`` attribute. The policies should be created before they are
 associated to the ports.
 
+QoS network policy
+==================
+
+The ``qos-port-network-policy`` extension adds the read only parameter
+``qos_network_policy_id`` to the port responses. This parameter contains the
+QoS policy ID of the network where this port is plugged.
+
 Regenerate mac address extension
 ================================
 
@@ -201,8 +208,9 @@ Response Parameters
    - network_id: network_id
    - port_security_enabled: port_security_enabled
    - project_id: project_id
-   - revision_number: revision_number
+   - qos_network_policy_id: qos_network_policy_id-port-response
    - qos_policy_id: qos_policy_id-port-response
+   - revision_number: revision_number
    - resource_request: port-resource
    - security_groups: port-security_groups
    - status: port-status
@@ -325,8 +333,9 @@ Response Parameters
    - network_id: network_id
    - port_security_enabled: port_security_enabled
    - project_id: project_id
-   - revision_number: revision_number
+   - qos_network_policy_id: qos_network_policy_id-port-response
    - qos_policy_id: qos_policy_id-port-response
+   - revision_number: revision_number
    - resource_request: port-resource
    - security_groups: port-security_groups
    - status: port-status
@@ -460,8 +469,9 @@ Response Parameters
    - network_id: network_id
    - port_security_enabled: port_security_enabled
    - project_id: project_id
-   - revision_number: revision_number
+   - qos_network_policy_id: qos_network_policy_id-port-response
    - qos_policy_id: qos_policy_id-port-response
+   - revision_number: revision_number
    - resource_request: port-resource
    - security_groups: port-security_groups
    - status: port-status
@@ -568,8 +578,9 @@ Response Parameters
    - network_id: network_id
    - port_security_enabled: port_security_enabled
    - project_id: project_id
-   - revision_number: revision_number
+   - qos_network_policy_id: qos_network_policy_id-port-response
    - qos_policy_id: qos_policy_id-port-response
+   - revision_number: revision_number
    - resource_request: port-resource
    - security_groups: port-security_groups
    - status: port-status
@@ -669,8 +680,9 @@ Response Parameters
    - network_id: network_id
    - port_security_enabled: port_security_enabled
    - project_id: project_id
-   - revision_number: revision_number
+   - qos_network_policy_id: qos_network_policy_id-port-response
    - qos_policy_id: qos_policy_id-port-response
+   - revision_number: revision_number
    - security_groups: port-security_groups
    - status: port-status
    - tags: tags
diff --git a/api-ref/source/v2/samples/ports/port-bind-create-response.json b/api-ref/source/v2/samples/ports/port-bind-create-response.json
index b7bb88297..8a3b55a28 100644
--- a/api-ref/source/v2/samples/ports/port-bind-create-response.json
+++ b/api-ref/source/v2/samples/ports/port-bind-create-response.json
@@ -59,6 +59,7 @@
         "tags": ["tag1,tag2"],
         "tenant_id": "d6700c0c9ffa4f1cb322cd4a1f3906fa",
         "updated_at": "2016-03-08T20:19:41",
+        "qos_network_policy_id": "174dd0c1-a4eb-49d4-a807-ae80246d82f4",
         "qos_policy_id": "29d5e02e-d5ab-4929-bee4-4a9fc12e22ae",
         "port_security_enabled": true,
         "resource_request": {
diff --git a/api-ref/source/v2/samples/ports/port-bind-show-response.json b/api-ref/source/v2/samples/ports/port-bind-show-response.json
index ce5e23be7..c2ce9b846 100644
--- a/api-ref/source/v2/samples/ports/port-bind-show-response.json
+++ b/api-ref/source/v2/samples/ports/port-bind-show-response.json
@@ -49,6 +49,7 @@
         "tags": ["tag1,tag2"],
         "tenant_id": "7e02058126cc4950b75f9970368ba177",
         "updated_at": "2016-03-08T20:19:41",
+        "qos_network_policy_id": "174dd0c1-a4eb-49d4-a807-ae80246d82f4",
         "qos_policy_id": "29d5e02e-d5ab-4929-bee4-4a9fc12e22ae",
         "resource_request": {
             "required": ["CUSTOM_PHYSNET_PUBLIC", "CUSTOM_VNIC_TYPE_NORMAL"],
diff --git a/api-ref/source/v2/samples/ports/port-bind-update-response.json b/api-ref/source/v2/samples/ports/port-bind-update-response.json
index d4c92db40..bb94aa6f9 100644
--- a/api-ref/source/v2/samples/ports/port-bind-update-response.json
+++ b/api-ref/source/v2/samples/ports/port-bind-update-response.json
@@ -46,6 +46,7 @@
         "tags": ["tag1,tag2"],
         "tenant_id": "522eda8d23124b25bf03fe44f1986b74",
         "updated_at": "2016-03-08T20:19:41",
+        "qos_network_policy_id": "174dd0c1-a4eb-49d4-a807-ae80246d82f4",
         "qos_policy_id": "29d5e02e-d5ab-4929-bee4-4a9fc12e22ae",
         "port_security_enabled": false,
         "resource_request": {
diff --git a/api-ref/source/v2/samples/ports/port-create-response.json b/api-ref/source/v2/samples/ports/port-create-response.json
index ece2d59a1..ea2d62cc9 100644
--- a/api-ref/source/v2/samples/ports/port-create-response.json
+++ b/api-ref/source/v2/samples/ports/port-create-response.json
@@ -47,6 +47,7 @@
         "tags": ["tag1,tag2"],
         "tenant_id": "d6700c0c9ffa4f1cb322cd4a1f3906fa",
         "updated_at": "2016-03-08T20:19:41",
+        "qos_network_policy_id": "174dd0c1-a4eb-49d4-a807-ae80246d82f4",
         "qos_policy_id": "29d5e02e-d5ab-4929-bee4-4a9fc12e22ae",
         "uplink_status_propagation": false
     }
diff --git a/api-ref/source/v2/samples/ports/port-show-response.json b/api-ref/source/v2/samples/ports/port-show-response.json
index 10ca7fe33..1b05171d4 100644
--- a/api-ref/source/v2/samples/ports/port-show-response.json
+++ b/api-ref/source/v2/samples/ports/port-show-response.json
@@ -40,6 +40,7 @@
         "tags": ["tag1,tag2"],
         "tenant_id": "7e02058126cc4950b75f9970368ba177",
         "updated_at": "2016-03-08T20:19:41",
+        "qos_network_policy_id": "174dd0c1-a4eb-49d4-a807-ae80246d82f4",
         "qos_policy_id": "29d5e02e-d5ab-4929-bee4-4a9fc12e22ae",
         "uplink_status_propagation": false
     }
diff --git a/api-ref/source/v2/samples/ports/port-update-response.json b/api-ref/source/v2/samples/ports/port-update-response.json
index 241a8f6a4..b52032396 100644
--- a/api-ref/source/v2/samples/ports/port-update-response.json
+++ b/api-ref/source/v2/samples/ports/port-update-response.json
@@ -46,6 +46,7 @@
         "tags": ["tag1,tag2"],
         "tenant_id": "522eda8d23124b25bf03fe44f1986b74",
         "updated_at": "2016-03-08T20:19:41",
+        "qos_network_policy_id": "174dd0c1-a4eb-49d4-a807-ae80246d82f4",
         "qos_policy_id": "29d5e02e-d5ab-4929-bee4-4a9fc12e22ae",
         "port_security_enabled": false,
         "uplink_status_propagation": false
diff --git a/api-ref/source/v2/samples/ports/ports-bind-list-response.json b/api-ref/source/v2/samples/ports/ports-bind-list-response.json
index bbd39171a..5f9993d36 100644
--- a/api-ref/source/v2/samples/ports/ports-bind-list-response.json
+++ b/api-ref/source/v2/samples/ports/ports-bind-list-response.json
@@ -42,6 +42,7 @@
             "status": "ACTIVE",
             "tenant_id": "",
             "updated_at": "2016-03-08T20:19:41",
+            "qos_network_policy_id": null,
             "qos_policy_id": "29d5e02e-d5ab-4929-bee4-4a9fc12e22ae",
             "resource_request": {
                 "required": ["CUSTOM_PHYSNET_PUBLIC", "CUSTOM_VNIC_TYPE_NORMAL"],
@@ -93,6 +94,7 @@
             "status": "ACTIVE",
             "tenant_id": "d397de8a63f341818f198abb0966f6f3",
             "updated_at": "2016-03-08T20:19:41",
+            "qos_network_policy_id": "174dd0c1-a4eb-49d4-a807-ae80246d82f4",
             "qos_policy_id": null,
             "tags": ["tag1,tag2"],
             "tenant_id": "d397de8a63f341818f198abb0966f6f3",
diff --git a/api-ref/source/v2/samples/ports/ports-bulk-create-response.json b/api-ref/source/v2/samples/ports/ports-bulk-create-response.json
index 801b2ef1b..1f0ad9acb 100644
--- a/api-ref/source/v2/samples/ports/ports-bulk-create-response.json
+++ b/api-ref/source/v2/samples/ports/ports-bulk-create-response.json
@@ -37,6 +37,7 @@
             "tags": ["tag1,tag2"],
             "tenant_id": "d6700c0c9ffa4f1cb322cd4a1f3906fa",
             "updated_at": "2016-03-08T20:19:41",
+            "qos_network_policy_id": null,
             "qos_policy_id": "29d5e02e-d5ab-4929-bee4-4a9fc12e22ae",
             "port_security_enabled": false,
             "uplink_status_propagation": false
@@ -79,6 +80,7 @@
             "tags": ["tag1,tag2"],
             "tenant_id": "d6700c0c9ffa4f1cb322cd4a1f3906fa",
             "updated_at": "2016-03-08T20:19:41",
+            "qos_network_policy_id": "174dd0c1-a4eb-49d4-a807-ae80246d82f4",
             "qos_policy_id": null,
             "port_security_enabled": false,
             "uplink_status_propagation": false
diff --git a/api-ref/source/v2/samples/ports/ports-list-response.json b/api-ref/source/v2/samples/ports/ports-list-response.json
index 68c554beb..824af849c 100644
--- a/api-ref/source/v2/samples/ports/ports-list-response.json
+++ b/api-ref/source/v2/samples/ports/ports-list-response.json
@@ -40,6 +40,7 @@
             "tags": ["tag1,tag2"],
             "tenant_id": "",
             "updated_at": "2016-03-08T20:19:41",
+            "qos_network_policy_id": "174dd0c1-a4eb-49d4-a807-ae80246d82f4",
             "qos_policy_id": "29d5e02e-d5ab-4929-bee4-4a9fc12e22ae",
             "port_security_enabled": false,
             "uplink_status_propagation": false
@@ -84,6 +85,7 @@
             "tags": ["tag1,tag2"],
             "tenant_id": "d397de8a63f341818f198abb0966f6f3",
             "updated_at": "2016-03-08T20:19:41",
+            "qos_network_policy_id": null,
             "qos_policy_id": null,
             "port_security_enabled": false,
             "uplink_status_propagation": false
diff --git a/neutron_lib/api/definitions/__init__.py b/neutron_lib/api/definitions/__init__.py
index a504a90d4..64d783eef 100644
--- a/neutron_lib/api/definitions/__init__.py
+++ b/neutron_lib/api/definitions/__init__.py
@@ -83,6 +83,7 @@ from neutron_lib.api.definitions import qos_bw_limit_direction
 from neutron_lib.api.definitions import qos_bw_minimum_ingress
 from neutron_lib.api.definitions import qos_default
 from neutron_lib.api.definitions import qos_gateway_ip
+from neutron_lib.api.definitions import qos_port_network_policy
 from neutron_lib.api.definitions import qos_rule_type_details
 from neutron_lib.api.definitions import qos_rules_alias
 from neutron_lib.api.definitions import rbac_security_groups
@@ -190,6 +191,7 @@ _ALL_API_DEFINITIONS = {
     qos_bw_minimum_ingress,
     qos_default,
     qos_gateway_ip,
+    qos_port_network_policy,
     qos_rule_type_details,
     qos_rules_alias,
     rbac_security_groups,
diff --git a/neutron_lib/api/definitions/base.py b/neutron_lib/api/definitions/base.py
index 5897a3c05..32b223e7c 100644
--- a/neutron_lib/api/definitions/base.py
+++ b/neutron_lib/api/definitions/base.py
@@ -124,6 +124,7 @@ KNOWN_EXTENSIONS = (
     'qos',
     'qos-bw-limit-direction',
     'qos-gateway-ip',
+    'qos-port-network-policy',
     'qos-rules-alias',
     'quotas',
     'rbac-policies',
diff --git a/neutron_lib/api/definitions/qos_port_network_policy.py b/neutron_lib/api/definitions/qos_port_network_policy.py
new file mode 100644
index 000000000..65888cc0c
--- /dev/null
+++ b/neutron_lib/api/definitions/qos_port_network_policy.py
@@ -0,0 +1,41 @@
+# Copyright (c) 2019 Red Hat Inc.
+# All rights reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+from neutron_lib.api.definitions import port as port_apidef
+from neutron_lib.api.definitions import qos as qos_apidef
+from neutron_lib.services.qos import constants as qos_const
+
+ALIAS = 'qos-port-network-policy'
+IS_SHIM_EXTENSION = False
+IS_STANDARD_ATTR_EXTENSION = False
+NAME = 'QoS port network policy ID'
+DESCRIPTION = 'Adds a the QoS network ID to the port definition'
+UPDATED_TIMESTAMP = '2019-11-01T10:00:00-00:00'
+RESOURCE_ATTRIBUTE_MAP = {
+    port_apidef.COLLECTION_NAME: {
+        qos_const.QOS_POLICY_ID: {
+            'allow_post': False,
+            'allow_put': False,
+            'is_visible': True,
+            'default': None,
+            'validate': {'type:uuid_or_none': None}
+        }
+    }
+}
+SUB_RESOURCE_ATTRIBUTE_MAP = {}
+ACTION_MAP = {}
+REQUIRED_EXTENSIONS = [qos_apidef.ALIAS]
+OPTIONAL_EXTENSIONS = []
+ACTION_STATUS = {}
diff --git a/neutron_lib/services/qos/constants.py b/neutron_lib/services/qos/constants.py
index e4a14cf1b..b585c8b2c 100644
--- a/neutron_lib/services/qos/constants.py
+++ b/neutron_lib/services/qos/constants.py
@@ -29,6 +29,7 @@ DIRECTION = "direction"
 DSCP_MARK = "dscp_mark"
 
 QOS_POLICY_ID = 'qos_policy_id'
+QOS_NETWORK_POLICY_ID = 'qos_network_policy_id'
 
 QOS_PLUGIN = 'qos_plugin'
 
diff --git a/neutron_lib/tests/unit/api/definitions/test_qos_port_network_policy.py b/neutron_lib/tests/unit/api/definitions/test_qos_port_network_policy.py
new file mode 100644
index 000000000..1ada20e7b
--- /dev/null
+++ b/neutron_lib/tests/unit/api/definitions/test_qos_port_network_policy.py
@@ -0,0 +1,25 @@
+# Copyright (c) 2019 Red Hat Inc.
+# All rights reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+from neutron_lib.api.definitions import port
+from neutron_lib.api.definitions import qos_port_network_policy
+from neutron_lib.services.qos import constants as qos_const
+from neutron_lib.tests.unit.api.definitions import base
+
+
+class QosPortNetworkPolicyTestCase(base.DefinitionBaseTestCase):
+    extension_module = qos_port_network_policy
+    extension_resources = (port.RESOURCE_NAME,)
+    extension_attributes = (qos_const.QOS_NETWORK_POLICY_ID,)
diff --git a/releasenotes/notes/qos-port-network-policy-c64c57cf2ccec725.yaml b/releasenotes/notes/qos-port-network-policy-c64c57cf2ccec725.yaml
new file mode 100644
index 000000000..1a5420484
--- /dev/null
+++ b/releasenotes/notes/qos-port-network-policy-c64c57cf2ccec725.yaml
@@ -0,0 +1,6 @@
+---
+features:
+  - |
+    Add field ``qos_port_network_policy_id`` to the ``port`` definition. This
+    read only parameter contains the QoS policy of the network where the port
+    is plugged.