diff --git a/neutron_lib/constants.py b/neutron_lib/constants.py
index 03b1e4e49..09673f425 100644
--- a/neutron_lib/constants.py
+++ b/neutron_lib/constants.py
@@ -367,14 +367,3 @@ VHOST_USER_DEVICE_PREFIX = 'vhu'
 VETH_DEVICE_PREFIX = 'qvo'
 # prefix for SNAT interface in DVR
 SNAT_INT_DEV_PREFIX = 'sg-'
-
-
-##########################
-# Plugin related constants
-##########################
-# Plugin constants that are universally used across all neutron repos.
-# The alias for the core plugin.
-# TODO(boden): remove and replace consumer usage with plugins/constants.py
-CORE = 'CORE'
-# The alias for the L3 plugin.
-L3 = 'L3_ROUTER_NAT'
diff --git a/neutron_lib/plugins/directory.py b/neutron_lib/plugins/directory.py
index 498556c97..fa75016ca 100644
--- a/neutron_lib/plugins/directory.py
+++ b/neutron_lib/plugins/directory.py
@@ -16,7 +16,7 @@ import weakref
 
 from oslo_concurrency import lockutils
 
-from neutron_lib import constants
+from neutron_lib.plugins import constants
 
 
 _synchronized = lockutils.synchronized_with_prefix("neutron-")
diff --git a/releasenotes/notes/rm-dup-pluginconst-085d0fcee4e931b8.yaml b/releasenotes/notes/rm-dup-pluginconst-085d0fcee4e931b8.yaml
new file mode 100644
index 000000000..eb9dfc7df
--- /dev/null
+++ b/releasenotes/notes/rm-dup-pluginconst-085d0fcee4e931b8.yaml
@@ -0,0 +1,5 @@
+---
+upgrade:
+  - The ``CORE`` and ``L3`` service type name constants have been removed
+    from ``neutron_lib.constants``. These constants are duplicates of those
+    in ``neutron_lib.plugin.constants`` and consumers should use the latter.