diff --git a/manifests/keystone/authtoken.pp b/manifests/keystone/authtoken.pp
index 6cc92ad..a9b0045 100644
--- a/manifests/keystone/authtoken.pp
+++ b/manifests/keystone/authtoken.pp
@@ -166,6 +166,11 @@
 #   true/false
 #   Defaults to $::os_service_default.
 #
+# [*interface*]
+#  (Optional) Interface to use for the Identity API endpoint. Valid values are
+#  "public", "internal" or "admin".
+#  Defaults to $::os_service_default.
+#
 class ec2api::keystone::authtoken(
   $password,
   $username                       = 'ec2api',
@@ -200,6 +205,7 @@ class ec2api::keystone::authtoken(
   $region_name                    = $::os_service_default,
   $token_cache_time               = $::os_service_default,
   $service_token_roles_required   = $::os_service_default,
+  $interface                      = $::os_service_default,
 ) {
 
   include ::ec2api::deps
@@ -238,5 +244,6 @@ class ec2api::keystone::authtoken(
     region_name                    => $region_name,
     token_cache_time               => $token_cache_time,
     service_token_roles_required   => $service_token_roles_required,
+    interface                      => $interface,
   }
 }
diff --git a/releasenotes/notes/keystone-authtoken-interface-ea4c6ce7e8bf7842.yaml b/releasenotes/notes/keystone-authtoken-interface-ea4c6ce7e8bf7842.yaml
new file mode 100644
index 0000000..64f4db5
--- /dev/null
+++ b/releasenotes/notes/keystone-authtoken-interface-ea4c6ce7e8bf7842.yaml
@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    The new ``ec2api::keystone::authtoken::interface`` parameter has been added,
+    which can be used to set the interface parameter in authtoken middleware.
diff --git a/spec/classes/ec2api_keystone_authtoken_spec.rb b/spec/classes/ec2api_keystone_authtoken_spec.rb
index 9192300..d46017c 100644
--- a/spec/classes/ec2api_keystone_authtoken_spec.rb
+++ b/spec/classes/ec2api_keystone_authtoken_spec.rb
@@ -47,6 +47,7 @@ describe 'ec2api::keystone::authtoken' do
         is_expected.to contain_ec2api_config('keystone_authtoken/region_name').with_value('<SERVICE DEFAULT>')
         is_expected.to contain_ec2api_config('keystone_authtoken/token_cache_time').with_value('<SERVICE DEFAULT>')
         is_expected.to contain_ec2api_config('keystone_authtoken/service_token_roles_required').with_value('<SERVICE DEFAULT>')
+        is_expected.to contain_ec2api_config('keystone_authtoken/interface').with_value('<SERVICE DEFAULT>')
       end
     end
 
@@ -88,6 +89,7 @@ describe 'ec2api::keystone::authtoken' do
           :region_name                          => 'region2',
           :token_cache_time                     => '301',
           :service_token_roles_required         => false,
+          :interface                            => 'internal',
         })
       end
 
@@ -124,6 +126,7 @@ describe 'ec2api::keystone::authtoken' do
         is_expected.to contain_ec2api_config('keystone_authtoken/region_name').with_value(params[:region_name])
         is_expected.to contain_ec2api_config('keystone_authtoken/token_cache_time').with_value(params[:token_cache_time])
         is_expected.to contain_ec2api_config('keystone_authtoken/service_token_roles_required').with_value(params[:service_token_roles_required])
+        is_expected.to contain_ec2api_config('keystone_authtoken/interface').with_value(params[:interface])
       end
 
       it 'installs python memcache package' do