diff --git a/neutron_lib/api/definitions/__init__.py b/neutron_lib/api/definitions/__init__.py
index b762abd70..441e1fde0 100644
--- a/neutron_lib/api/definitions/__init__.py
+++ b/neutron_lib/api/definitions/__init__.py
@@ -99,6 +99,7 @@ from neutron_lib.api.definitions import subnet
 from neutron_lib.api.definitions import subnet_onboard
 from neutron_lib.api.definitions import subnet_segmentid_enforce
 from neutron_lib.api.definitions import subnet_segmentid_writable
+from neutron_lib.api.definitions import subnet_service_types
 from neutron_lib.api.definitions import subnetpool
 from neutron_lib.api.definitions import subnetpool_prefix_ops
 from neutron_lib.api.definitions import trunk
@@ -200,6 +201,7 @@ _ALL_API_DEFINITIONS = {
     subnet_onboard,
     subnet_segmentid_enforce,
     subnet_segmentid_writable,
+    subnet_service_types,
     subnetpool,
     subnetpool_prefix_ops,
     trunk,
diff --git a/neutron_lib/api/definitions/base.py b/neutron_lib/api/definitions/base.py
index e5d1f962d..81d6b10cb 100644
--- a/neutron_lib/api/definitions/base.py
+++ b/neutron_lib/api/definitions/base.py
@@ -42,6 +42,7 @@ KNOWN_ATTRIBUTES = (
     'prefixlen',
     'project_id',
     'qos_policy_id',
+    'service_types',
     constants.SHARED,
     'status',
     'subnets',
@@ -135,6 +136,7 @@ KNOWN_EXTENSIONS = (
     'standard-attr-revisions',
     'standard-attr-segment',
     'standard-attr-timestamp',
+    'subnet',
     'subnet_allocation',
     'subnet_onboard',
     'subnetpool-prefix-ops',
diff --git a/neutron_lib/api/definitions/subnet_service_types.py b/neutron_lib/api/definitions/subnet_service_types.py
new file mode 100644
index 000000000..d3abfee76
--- /dev/null
+++ b/neutron_lib/api/definitions/subnet_service_types.py
@@ -0,0 +1,43 @@
+#    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 subnet as subnet_def
+from neutron_lib import constants
+
+
+ALIAS = 'subnet-service-types'
+IS_SHIM_EXTENSION = False
+IS_STANDARD_ATTR_EXTENSION = False
+NAME = 'Subnet service types'
+API_PREFIX = ''
+DESCRIPTION = "Provides ability to set the subnet service_types field"
+UPDATED_TIMESTAMP = "2016-03-15T18:00:00-00:00"
+RESOURCE_NAME = 'service_type'
+COLLECTION_NAME = 'service_types'
+
+RESOURCE_ATTRIBUTE_MAP = {
+    subnet_def.COLLECTION_NAME: {
+        COLLECTION_NAME: {
+            'allow_post': True,
+            'allow_put': True,
+            'default': constants.ATTR_NOT_SPECIFIED,
+            'validate': {'type:list_of_subnet_service_types': None},
+            'is_visible': True
+        }
+    }
+}
+
+SUB_RESOURCE_ATTRIBUTE_MAP = {}
+ACTION_MAP = {}
+ACTION_STATUS = {}
+REQUIRED_EXTENSIONS = []
+OPTIONAL_EXTENSIONS = []
diff --git a/neutron_lib/api/validators/__init__.py b/neutron_lib/api/validators/__init__.py
index eff16ba43..896a7bd7d 100644
--- a/neutron_lib/api/validators/__init__.py
+++ b/neutron_lib/api/validators/__init__.py
@@ -21,6 +21,7 @@ from oslo_utils import netutils
 from oslo_utils import strutils
 from oslo_utils import uuidutils
 import six
+from webob import exc
 
 from neutron_lib._i18n import _
 from neutron_lib import constants
@@ -1101,6 +1102,24 @@ def validate_service_plugin_type(data, valid_values=None):
         raise n_exc.InvalidServiceType(service_type=data)
 
 
+def validate_subnet_service_types(service_types, valid_values=None):
+    if service_types:
+        if not isinstance(service_types, list):
+            raise exc.HTTPBadRequest(
+                _("Subnet service types must be a list."))
+
+        # Include standard prefixes
+        prefixes = list(constants.DEVICE_OWNER_PREFIXES)
+        prefixes += constants.DEVICE_OWNER_COMPUTE_PREFIX
+
+        for service_type in service_types:
+            if not isinstance(service_type, six.text_type):
+                raise n_exc.InvalidInputSubnetServiceType(
+                    service_type=service_type)
+            elif not service_type.startswith(tuple(prefixes)):
+                raise n_exc.InvalidSubnetServiceType(service_type=service_type)
+
+
 # Dictionary that maintains a list of validation functions
 validators = {'type:dict': validate_dict,
               'type:dict_or_none': validate_dict_or_none,
@@ -1144,7 +1163,9 @@ validators = {'type:dict': validate_dict,
               'type:list_of_any_key_specs_or_none':
                   validate_any_key_specs_or_none,
               'type:service_plugin_type': validate_service_plugin_type,
-              'type:list_of_subnets_or_none': validate_subnet_list_or_none
+              'type:list_of_subnets_or_none': validate_subnet_list_or_none,
+              'type:list_of_subnet_service_types':
+                  validate_subnet_service_types
               }
 
 
diff --git a/neutron_lib/exceptions/__init__.py b/neutron_lib/exceptions/__init__.py
index 9f5b73c54..effc18397 100644
--- a/neutron_lib/exceptions/__init__.py
+++ b/neutron_lib/exceptions/__init__.py
@@ -807,3 +807,12 @@ class ProcessExecutionError(RuntimeError):
     def __init__(self, message, returncode):
         super(ProcessExecutionError, self).__init__(message)
         self.returncode = returncode
+
+
+class InvalidSubnetServiceType(InvalidInput):
+    message = _("Subnet service type %(service_type)s does not correspond "
+                "to a valid device owner.")
+
+
+class InvalidInputSubnetServiceType(InvalidInput):
+    message = _("Subnet service type %(service_type)s is not a string.")
diff --git a/neutron_lib/tests/unit/api/definitions/test_subnet_service_types.py b/neutron_lib/tests/unit/api/definitions/test_subnet_service_types.py
new file mode 100644
index 000000000..ec0bc2397
--- /dev/null
+++ b/neutron_lib/tests/unit/api/definitions/test_subnet_service_types.py
@@ -0,0 +1,21 @@
+#    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 subnet as subnet_def
+from neutron_lib.api.definitions import subnet_service_types
+from neutron_lib.tests.unit.api.definitions import base
+
+
+class SubnetServiceTypesDefinitionTestCase(base.DefinitionBaseTestCase):
+    extension_module = subnet_service_types
+    extension_resource = (subnet_def.RESOURCE_NAME,)
+    extension_attributes = ()
diff --git a/releasenotes/notes/rehome-subnetservicetypes-apidef-31e2e9564c746317.yaml b/releasenotes/notes/rehome-subnetservicetypes-apidef-31e2e9564c746317.yaml
new file mode 100644
index 000000000..c1ffb61bf
--- /dev/null
+++ b/releasenotes/notes/rehome-subnetservicetypes-apidef-31e2e9564c746317.yaml
@@ -0,0 +1,7 @@
+---
+features:
+  - The ``subnet-service-types`` extension is now available in
+    ``neutron_lib.api.definitions.subnet_service_types``.
+  - The ``InvalidSubnetServiceType`` and ``InvalidInputSubnetServiceType``
+    exceptions are now available in ``neutron_lib.exceptions``.
+  - The validation type ``list_of_subnet_service_types`` is now available.