diff --git a/manifests/db.pp b/manifests/db.pp
index df5d4d2..6bd2a17 100644
--- a/manifests/db.pp
+++ b/manifests/db.pp
@@ -156,7 +156,7 @@ define oslo::db(
   if !is_service_default($connection) {
 
     validate_legacy(Oslo::Dbconn, 'validate_re', $connection,
-      ['^(sqlite|mysql(\+pymysql)?|postgresql(\+psycopg2)?|mongodb):\/\/(\S+:\S+@\S+\/\S+)?'])
+      ['^(sqlite|mysql(\+pymysql)?|postgresql(\+psycopg2)?):\/\/(\S+:\S+@\S+\/\S+)?'])
 
     if $manage_backend_package {
       case $connection {
@@ -173,9 +173,6 @@ define oslo::db(
           $backend_package = false
           require 'postgresql::lib::python'
         }
-        /^mongodb:\/\//: {
-          $backend_package = $::oslo::params::pymongo_package_name
-        }
         /^sqlite:\/\//: {
           $backend_package = $::oslo::params::sqlite_package_name
         }
diff --git a/manifests/params.pp b/manifests/params.pp
index 9c0ff84..3445fff 100644
--- a/manifests/params.pp
+++ b/manifests/params.pp
@@ -5,7 +5,6 @@
 class oslo::params {
   include openstacklib::defaults
 
-  $pymongo_package_name = 'python3-pymongo'
   $pylibmc_package_name = 'python3-pylibmc'
 
   case $::osfamily {
diff --git a/releasenotes/notes/remove-mongo-01c0895a76175bb4.yaml b/releasenotes/notes/remove-mongo-01c0895a76175bb4.yaml
new file mode 100644
index 0000000..bf7b940
--- /dev/null
+++ b/releasenotes/notes/remove-mongo-01c0895a76175bb4.yaml
@@ -0,0 +1,4 @@
+---
+upgrade:
+  - |
+    The ``oslo::db`` defined resource type no longer supports MongoDB backend.
diff --git a/spec/defines/oslo_db_spec.rb b/spec/defines/oslo_db_spec.rb
index 22bd009..866f1b8 100644
--- a/spec/defines/oslo_db_spec.rb
+++ b/spec/defines/oslo_db_spec.rb
@@ -78,41 +78,6 @@ describe 'oslo::db' do
       end
     end
 
-    context 'with mongodb backend' do
-      let :params do
-        { :connection => 'mongodb://localhost:1234/db' }
-      end
-
-      it 'install the proper backend package' do
-        is_expected.to contain_package(platform_params[:pymongo_package_name]).with(
-          :ensure => 'present',
-          :name   => platform_params[:pymongo_package_name],
-          :tag    => 'openstack'
-        )
-      end
-
-      context 'with backend package management disabled' do
-        before do
-          params.merge!({
-            :manage_backend_package => false,
-          })
-        end
-
-        it 'does not install backend package' do
-          is_expected.not_to contain_package('python-pymongo')
-        end
-      end
-    end
-
-    context 'with specific mongodb connection string' do
-      let :params do
-        { :connection => 'mongodb://user:password@host1:27017,host2:27017,host3:27017/db_name?replicaSet=replica&readPreference=primaryPreferred' }
-      end
-
-      it { is_expected.to contain_keystone_config('database/connection').with_value(
-        'mongodb://user:password@host1:27017,host2:27017,host3:27017/db_name?replicaSet=replica&readPreference=primaryPreferred').with_secret(true) }
-    end
-
     context 'with pymysql connection' do
       let :params do
         { :connection => 'mysql+pymysql://db:db@localhost/db' }