diff --git a/releasenotes/notes/networks_data_option-6c613c0d118ccfc8.yaml b/releasenotes/notes/networks_data_option-6c613c0d118ccfc8.yaml
new file mode 100644
index 000000000..cac856525
--- /dev/null
+++ b/releasenotes/notes/networks_data_option-6c613c0d118ccfc8.yaml
@@ -0,0 +1,6 @@
+---
+features:
+  - |
+    A new -n/--networks-data option has been added.  This allows overriding the
+    default network_data.yaml, similar to the existing interface for
+    roles_data.yaml.
diff --git a/tripleoclient/constants.py b/tripleoclient/constants.py
index 338ce6770..f11f37775 100644
--- a/tripleoclient/constants.py
+++ b/tripleoclient/constants.py
@@ -34,6 +34,7 @@ SERVICE_LIST = {
 TRIPLEO_HEAT_TEMPLATES = "/usr/share/openstack-tripleo-heat-templates/"
 OVERCLOUD_YAML_NAME = "overcloud.yaml"
 OVERCLOUD_ROLES_FILE = "roles_data.yaml"
+OVERCLOUD_NETWORKS_FILE = "network_data.yaml"
 RHEL_REGISTRATION_EXTRACONFIG_NAME = (
     "extraconfig/pre_deploy/rhel-registration/")
 
diff --git a/tripleoclient/v1/overcloud_deploy.py b/tripleoclient/v1/overcloud_deploy.py
index d637b7316..634712e11 100644
--- a/tripleoclient/v1/overcloud_deploy.py
+++ b/tripleoclient/v1/overcloud_deploy.py
@@ -398,12 +398,14 @@ class DeployOvercloud(command.Command):
             plan_management.update_plan_from_templates(
                 self.clients, parsed_args.stack, tht_root,
                 parsed_args.roles_file, generate_passwords,
-                parsed_args.plan_environment_file)
+                parsed_args.plan_environment_file,
+                parsed_args.networks_file)
         else:
             plan_management.create_plan_from_templates(
                 self.clients, parsed_args.stack, tht_root,
                 parsed_args.roles_file, generate_passwords,
-                parsed_args.plan_environment_file)
+                parsed_args.plan_environment_file,
+                parsed_args.networks_file)
 
         # Get any missing (e.g j2 rendered) files from the plan to tht_root
         self._download_missing_files_from_plan(
@@ -714,6 +716,11 @@ class DeployOvercloud(command.Command):
             help=_('Roles file, overrides the default %s in the --templates '
                    'directory') % constants.OVERCLOUD_ROLES_FILE
         )
+        parser.add_argument(
+            '--networks-file', '-n', dest='networks_file',
+            help=_('Networks file, overrides the default %s in the '
+                   '--templates directory') % constants.OVERCLOUD_NETWORKS_FILE
+        )
         parser.add_argument(
             '--plan-environment-file', '-p',
             help=_('Plan Environment file, overrides the default %s in the '
diff --git a/tripleoclient/workflows/plan_management.py b/tripleoclient/workflows/plan_management.py
index ee155668a..ea65ecd34 100644
--- a/tripleoclient/workflows/plan_management.py
+++ b/tripleoclient/workflows/plan_management.py
@@ -31,7 +31,7 @@ _WORKFLOW_TIMEOUT = 360  # 6 * 60 seconds
 
 
 def _upload_templates(swift_client, container_name, tht_root, roles_file=None,
-                      plan_env_file=None):
+                      plan_env_file=None, networks_file=None):
     """tarball up a given directory and upload it to Swift to be extracted"""
 
     with tempfile.NamedTemporaryFile() as tmp_tarball:
@@ -45,6 +45,14 @@ def _upload_templates(swift_client, container_name, tht_root, roles_file=None,
             swift_client.put_object(container_name,
                                     constants.OVERCLOUD_ROLES_FILE,
                                     rf)
+
+    # Allow optional override of the network_data.yaml file
+    if networks_file:
+        with open(networks_file) as rf:
+            swift_client.put_object(container_name,
+                                    constants.OVERCLOUD_NETWORKS_FILE,
+                                    rf)
+
     # Optional override of the plan-environment.yaml file
     if plan_env_file:
         # TODO(jpalanis): Instead of overriding default file,
@@ -140,7 +148,8 @@ def create_container(workflow_client, **input_):
 
 
 def create_plan_from_templates(clients, name, tht_root, roles_file=None,
-                               generate_passwords=True, plan_env_file=None):
+                               generate_passwords=True, plan_env_file=None,
+                               networks_file=None):
     workflow_client = clients.workflow_engine
     swift_client = clients.tripleoclient.object_store
 
@@ -153,7 +162,8 @@ def create_plan_from_templates(clients, name, tht_root, roles_file=None,
             "Unable to create plan. {}".format(result))
 
     print("Creating plan from template files in: {}".format(tht_root))
-    _upload_templates(swift_client, name, tht_root, roles_file, plan_env_file)
+    _upload_templates(swift_client, name, tht_root, roles_file, plan_env_file,
+                      networks_file)
 
     try:
         create_deployment_plan(clients, container=name,
@@ -165,7 +175,8 @@ def create_plan_from_templates(clients, name, tht_root, roles_file=None,
 
 
 def update_plan_from_templates(clients, name, tht_root, roles_file=None,
-                               generate_passwords=True, plan_env_file=None):
+                               generate_passwords=True, plan_env_file=None,
+                               networks_file=None):
     swift_client = clients.tripleoclient.object_store
 
     # If the plan environment was migrated to Swift, save the generated
@@ -196,7 +207,8 @@ def update_plan_from_templates(clients, name, tht_root, roles_file=None,
     # need to special-case plan-environment.yaml to avoid this.
 
     print("Uploading new plan files")
-    _upload_templates(swift_client, name, tht_root, roles_file, plan_env_file)
+    _upload_templates(swift_client, name, tht_root, roles_file, plan_env_file,
+                      networks_file)
     _update_passwords(swift_client, name, passwords)
     update_deployment_plan(clients, container=name,
                            queue_name=str(uuid.uuid4()),