diff --git a/neutron_lib/plugins/constants.py b/neutron_lib/plugins/constants.py
index a67439cbb..6b6ca7e9b 100644
--- a/neutron_lib/plugins/constants.py
+++ b/neutron_lib/plugins/constants.py
@@ -26,3 +26,4 @@ LOG_API = "LOGGING"
 PORTFORWARDING = "PORTFORWARDING"
 FLOATINGIPPOOL = "FLOATINGIPPOOL"
 NETWORK_SEGMENT_RANGE = "NETWORK_SEGMENT_RANGE"
+CONNTRACKHELPER = "CONNTRACKHELPER"
diff --git a/neutron_lib/services/constants.py b/neutron_lib/services/constants.py
index cad5ac52e..5a5f374fe 100644
--- a/neutron_lib/services/constants.py
+++ b/neutron_lib/services/constants.py
@@ -25,5 +25,6 @@ from neutron_lib.plugins import constants as plugin_const
 # SERVICE_PLUGIN_NAME is the service plugin which introduced the resource and
 # registered the service plugin name in neutron-lib.
 EXT_PARENT_RESOURCE_MAPPING = {
-    l3.FLOATINGIP: plugin_const.L3
+    l3.FLOATINGIP: plugin_const.L3,
+    l3.ROUTER: plugin_const.CONNTRACKHELPER
 }
diff --git a/releasenotes/notes/conntrack-helper-parent-resource-mapping-95a4a2cb6f6536fe.yaml b/releasenotes/notes/conntrack-helper-parent-resource-mapping-95a4a2cb6f6536fe.yaml
new file mode 100644
index 000000000..88b43c20a
--- /dev/null
+++ b/releasenotes/notes/conntrack-helper-parent-resource-mapping-95a4a2cb6f6536fe.yaml
@@ -0,0 +1,6 @@
+---
+other:
+  - |
+    Parent resource mapping was added to ``EXT_PARENT_RESOURCE_MAPPING`` in
+    ``neutron_lib.services.constants`` for the ``l3-conntrack-helper``
+    extension.