diff --git a/manifests/api.pp b/manifests/api.pp
index 73fa7371..77e8bcd5 100644
--- a/manifests/api.pp
+++ b/manifests/api.pp
@@ -237,6 +237,10 @@
 #   HTTPProxyToWSGI middleware.
 #   Defaults to $::os_service_default.
 #
+# [*max_request_body_size*]
+#   (Optional) Set max request body size
+#   Defaults to $::os_service_default.
+#
 class barbican::api (
   $package_ensure                                = 'present',
   $client_package_ensure                         = 'present',
@@ -287,6 +291,7 @@ class barbican::api (
   $key_file                                      = $::os_service_default,
   $service_name                                  = 'barbican-api',
   $enable_proxy_headers_parsing                  = $::os_service_default,
+  $max_request_body_size                         = $::os_service_default,
 ) inherits barbican::params {
 
   include ::barbican::deps
@@ -490,6 +495,7 @@ class barbican::api (
 
   oslo::middleware { 'barbican_config':
     enable_proxy_headers_parsing => $enable_proxy_headers_parsing,
+    max_request_body_size        => $max_request_body_size,
   }
 
 }
diff --git a/releasenotes/notes/max_request_body_size-8ffc79894afb2669.yaml b/releasenotes/notes/max_request_body_size-8ffc79894afb2669.yaml
new file mode 100644
index 00000000..f29fec52
--- /dev/null
+++ b/releasenotes/notes/max_request_body_size-8ffc79894afb2669.yaml
@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    Add support to configure `[oslo_middleware]/max_request_body_size` with
+    `$max_request_body_size`.
diff --git a/spec/classes/barbican_api_spec.rb b/spec/classes/barbican_api_spec.rb
index df534e62..e2c351be 100644
--- a/spec/classes/barbican_api_spec.rb
+++ b/spec/classes/barbican_api_spec.rb
@@ -62,6 +62,7 @@ describe 'barbican::api' do
         :retry_scheduler_periodic_interval_max_seconds => '<SERVICE DEFAULT>',
         :service_name                                  => platform_params[:service_name],
         :enable_proxy_headers_parsing                  => '<SERVICE DEFAULT>',
+        :max_request_body_size                         => '<SERVICE DEFAULT>',
         :multiple_secret_stores_enabled                => false,
         :enabled_secret_stores                         => 'simple_crypto',
       }
@@ -103,6 +104,7 @@ describe 'barbican::api' do
         :max_allowed_secret_in_bytes                   => 20000,
         :max_allowed_request_size_in_bytes             => 2000000,
         :enable_proxy_headers_parsing                  => false,
+        :max_request_body_size                         => '102400',
         :multiple_secret_stores_enabled                => true,
         :enabled_secret_stores                         => 'simple_crypto,dogtag,kmip',
       }
@@ -210,6 +212,21 @@ describe 'barbican::api' do
       )}
     end
 
+    describe 'with max_request_body_size' do
+      let :pre_condition do
+        'class { "barbican::keystone::authtoken": password => "secret", }
+        include ::apache'
+      end
+
+      let :params do
+        default_params.merge!({:max_request_body_size => '102400' })
+      end
+
+      it { is_expected.to contain_oslo__middleware('barbican_config').with(
+        :max_request_body_size => '102400',
+      )}
+    end
+
     describe 'with SSL socket options set' do
       let :pre_condition do
           'class { "barbican::keystone::authtoken": password => "secret", }