diff --git a/manifests/plugins/ml2/ovn.pp b/manifests/plugins/ml2/ovn.pp
index 404dbf894..03090a8cb 100644
--- a/manifests/plugins/ml2/ovn.pp
+++ b/manifests/plugins/ml2/ovn.pp
@@ -60,12 +60,6 @@
 #            that are no longer in Neutron.
 #   Defaults to $::os_service_default
 #
-# [*ovn_l3_mode*]
-#   (optional) Whether to use OVN native L3 support. Do not change the
-#   value for existing deployments that contain routers.
-#   Type: boolean
-#   Defaults to $::os_service_default
-#
 # [*vif_type*]
 #   (optional) Type of VIF to be used for ports.
 #   Valid values are 'ovs', 'vhostuser'
@@ -101,7 +95,15 @@
 #              grep "Check pkt length action".
 #   Type: boolean
 #   Defaults to $::os_service_default
-
+#
+# DEPRECATED PARAMETERS
+#
+# [*ovn_l3_mode*]
+#   (optional) Whether to use OVN native L3 support. Do not change the
+#   value for existing deployments that contain routers.
+#   Type: boolean
+#   Defaults to undef
+#
 class neutron::plugins::ml2::ovn(
   $ovn_nb_connection        = $::os_service_default,
   $ovn_sb_connection        = $::os_service_default,
@@ -114,20 +116,21 @@ class neutron::plugins::ml2::ovn(
   $package_ensure           = 'present',
   $ovsdb_connection_timeout = $::os_service_default,
   $neutron_sync_mode        = $::os_service_default,
-  $ovn_l3_mode              = $::os_service_default,
   $vif_type                 = $::os_service_default,
   $ovn_metadata_enabled     = $::os_service_default,
   $dvr_enabled              = $::os_service_default,
   $dns_servers              = $::os_service_default,
   $vhostuser_socket_dir     = $::os_service_default,
   $ovn_emit_need_to_frag    = $::os_service_default,
-  ) {
+  # DEPRECATED PARAMETERS
+  $ovn_l3_mode              = undef,
+) {
 
   include neutron::deps
   require neutron::plugins::ml2
 
-  if ! is_service_default($ovn_l3_mode) {
-    validate_legacy(Boolean, 'validate_bool', $ovn_l3_mode)
+  if $ovn_l3_mode != undef {
+    warning('The ovn_l3_mode parameter has been deprecated and has no effect')
   }
 
   if ! ( $vif_type in ['ovs', 'vhostuser', $::os_service_default] ) {
@@ -156,7 +159,6 @@ class neutron::plugins::ml2::ovn(
     'ovn/ovn_sb_ca_cert'           : value => $ovn_sb_ca_cert;
     'ovn/ovsdb_connection_timeout' : value => $ovsdb_connection_timeout;
     'ovn/neutron_sync_mode'        : value => $neutron_sync_mode;
-    'ovn/ovn_l3_mode'              : value => $ovn_l3_mode;
     'ovn/vif_type'                 : value => $vif_type;
     'ovn/ovn_metadata_enabled'     : value => $ovn_metadata_enabled;
     'ovn/enable_distributed_floating_ip' : value => $dvr_enabled;
@@ -164,4 +166,9 @@ class neutron::plugins::ml2::ovn(
     'ovn/vhost_sock_dir'           : value => $vhostuser_socket_dir;
     'ovn/ovn_emit_need_to_frag'    : value => $ovn_emit_need_to_frag;
   }
+
+  # TODO(tkajinam): Remove this when removing the deprecated parameters
+  neutron_plugin_ml2 {
+    'ovn/ovn_l3_mode' : ensure => absent;
+  }
 }
diff --git a/releasenotes/notes/deprecate-ovn_l3_mode-91308d51a9596f22.yaml b/releasenotes/notes/deprecate-ovn_l3_mode-91308d51a9596f22.yaml
new file mode 100644
index 000000000..361f0f15d
--- /dev/null
+++ b/releasenotes/notes/deprecate-ovn_l3_mode-91308d51a9596f22.yaml
@@ -0,0 +1,5 @@
+---
+deprecations:
+  - |
+    The ``neutron::plugins::ml2::ovn::ovn_l3_mode`` parameter has been
+    deprecated and has no effect now.
diff --git a/spec/classes/neutron_plugins_ml2_ovn_spec.rb b/spec/classes/neutron_plugins_ml2_ovn_spec.rb
index e6d3668c5..d0487e1ab 100644
--- a/spec/classes/neutron_plugins_ml2_ovn_spec.rb
+++ b/spec/classes/neutron_plugins_ml2_ovn_spec.rb
@@ -21,7 +21,6 @@ describe 'neutron::plugins::ml2::ovn' do
        :ovn_sb_ca_cert           => 'sb_ca_cert',
        :ovsdb_connection_timeout => '60',
        :neutron_sync_mode        => 'log',
-       :ovn_l3_mode              => true,
        :vif_type                 => 'ovs',
        :dvr_enabled              => false,
        :dns_servers              => ['8.8.8.8', '10.10.10.10'],
@@ -50,7 +49,6 @@ describe 'neutron::plugins::ml2::ovn' do
       should contain_neutron_plugin_ml2('ovn/ovn_sb_ca_cert').with_value(params[:ovn_sb_ca_cert])
       should contain_neutron_plugin_ml2('ovn/ovsdb_connection_timeout').with_value(params[:ovsdb_connection_timeout])
       should contain_neutron_plugin_ml2('ovn/neutron_sync_mode').with_value(params[:neutron_sync_mode])
-      should contain_neutron_plugin_ml2('ovn/ovn_l3_mode').with_value(params[:ovn_l3_mode])
       should contain_neutron_plugin_ml2('ovn/vif_type').with_value(params[:vif_type])
       should contain_neutron_plugin_ml2('ovn/enable_distributed_floating_ip').with_value(params[:dvr_enabled])
       should contain_neutron_plugin_ml2('ovn/dns_servers').with_value(params[:dns_servers].join(','))