diff --git a/neutron_lib/api/definitions/__init__.py b/neutron_lib/api/definitions/__init__.py
index 0686665ef..80d05d308 100644
--- a/neutron_lib/api/definitions/__init__.py
+++ b/neutron_lib/api/definitions/__init__.py
@@ -63,6 +63,7 @@ from neutron_lib.api.definitions import subnet_onboard
 from neutron_lib.api.definitions import subnetpool
 from neutron_lib.api.definitions import trunk
 from neutron_lib.api.definitions import trunk_details
+from neutron_lib.api.definitions import vlantransparent
 
 
 _ALL_API_DEFINITIONS = {
@@ -118,5 +119,6 @@ _ALL_API_DEFINITIONS = {
     subnet_onboard,
     subnetpool,
     trunk,
-    trunk_details
+    trunk_details,
+    vlantransparent
 }
diff --git a/neutron_lib/api/definitions/vlantransparent.py b/neutron_lib/api/definitions/vlantransparent.py
new file mode 100644
index 000000000..67159c333
--- /dev/null
+++ b/neutron_lib/api/definitions/vlantransparent.py
@@ -0,0 +1,60 @@
+# Copyright (c) 2015 Cisco Systems, 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 import converters
+from neutron_lib.api.definitions import network
+from neutron_lib.api import validators
+from neutron_lib import constants
+
+
+VLANTRANSPARENT = 'vlan_transparent'
+
+
+def get_vlan_transparent(network):
+    """Get the value of vlan_transparent from a network if set.
+
+    :param network: The network dict to retrieve the value of vlan_transparent
+        from.
+    :returns: The value of vlan_transparent from the network dict if set in
+        the dict, otherwise False is returned.
+    """
+    return (network[VLANTRANSPARENT]
+            if (VLANTRANSPARENT in network and
+                validators.is_attr_set(network[VLANTRANSPARENT]))
+            else False)
+
+
+ALIAS = 'vlan-transparent'
+IS_SHIM_EXTENSION = False
+IS_STANDARD_ATTR_EXTENSION = False
+NAME = 'Vlantransparent'
+API_PREFIX = ''
+DESCRIPTION = 'Provides Vlan Transparent Networks'
+UPDATED_TIMESTAMP = '2015-03-23T09:00:00-00:00'
+RESOURCE_ATTRIBUTE_MAP = {
+    network.COLLECTION_NAME: {
+        VLANTRANSPARENT: {
+            'allow_post': True,
+            'allow_put': False,
+            'convert_to': converters.convert_to_boolean,
+            'default': constants.ATTR_NOT_SPECIFIED,
+            'is_visible': True
+        }
+    }
+}
+SUB_RESOURCE_ATTRIBUTE_MAP = {}
+ACTION_MAP = {}
+REQUIRED_EXTENSIONS = []
+OPTIONAL_EXTENSIONS = []
+ACTION_STATUS = {}
diff --git a/neutron_lib/exceptions/vlantransparent.py b/neutron_lib/exceptions/vlantransparent.py
new file mode 100644
index 000000000..212d5fb54
--- /dev/null
+++ b/neutron_lib/exceptions/vlantransparent.py
@@ -0,0 +1,21 @@
+# Copyright (c) 2015 Cisco Systems, 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._i18n import _
+from neutron_lib import exceptions
+
+
+class VlanTransparencyDriverError(exceptions.NeutronException):
+    """Vlan Transparency not supported by all mechanism drivers."""
+    message = _("Backend does not support VLAN Transparency.")
diff --git a/neutron_lib/tests/unit/api/definitions/test_vlantransparent.py b/neutron_lib/tests/unit/api/definitions/test_vlantransparent.py
new file mode 100644
index 000000000..6925f8bbf
--- /dev/null
+++ b/neutron_lib/tests/unit/api/definitions/test_vlantransparent.py
@@ -0,0 +1,28 @@
+#    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 vlantransparent
+from neutron_lib.tests.unit.api.definitions import base
+
+
+class VlantransparentDefinitionTestCase(base.DefinitionBaseTestCase):
+    extension_module = vlantransparent
+    extension_resources = ()
+    extension_attributes = (vlantransparent.VLANTRANSPARENT,)
+
+    def test_get_vlan_transparent(self):
+        self.assertTrue(vlantransparent.get_vlan_transparent(
+            {vlantransparent.VLANTRANSPARENT: True, 'vlan': '1'}))
+
+    def test_get_vlan_transparent_not_set(self):
+        self.assertFalse(vlantransparent.get_vlan_transparent(
+            {'vlanxtx': True, 'vlan': '1'}))
diff --git a/releasenotes/notes/rehome-vlantransp-apidef-1cd7d3ace9042686.yaml b/releasenotes/notes/rehome-vlantransp-apidef-1cd7d3ace9042686.yaml
new file mode 100644
index 000000000..4fb0b057b
--- /dev/null
+++ b/releasenotes/notes/rehome-vlantransp-apidef-1cd7d3ace9042686.yaml
@@ -0,0 +1,6 @@
+---
+features:
+  - The ``vlan-transparent`` extension's API definition is now available in
+    ``neutron_lib.api.definitions.vlantransparent``.
+  - The ``get_vlan_transparent`` function from the ``vlan-transparent``
+    extension is available in ``neutron_lib.api.definitions.vlantransparent``.