diff --git a/core/modules/migrate/config/schema/migrate.source.schema.yml b/core/modules/migrate/config/schema/migrate.source.schema.yml
index 2152c5e..97cab99 100644
--- a/core/modules/migrate/config/schema/migrate.source.schema.yml
+++ b/core/modules/migrate/config/schema/migrate.source.schema.yml
@@ -237,6 +237,21 @@ migrate.source.empty:
           type: boolean
           label: 'Display field'
 
+migrate.source.d6_user:
+  type: migrate_source
+  label: 'Drupal 6 user'
+  mapping:
+    constants:
+      type: mapping
+      label: 'Constants'
+      mapping:
+        key:
+          type: string
+          label: 'User data key'
+        module:
+          type: string
+          label: 'Module name'
+
 migrate.source.d6_user_picture_file:
   type: migrate_source
   label: 'Drupal 6 user picure display'
diff --git a/core/modules/migrate/src/Plugin/migrate/destination/UserData.php b/core/modules/migrate/src/Plugin/migrate/destination/UserData.php
new file mode 100644
index 0000000..9c667eb
--- /dev/null
+++ b/core/modules/migrate/src/Plugin/migrate/destination/UserData.php
@@ -0,0 +1,91 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\migrate\Plugin\migrate\destination\UserData.
+ */
+
+namespace Drupal\migrate\Plugin\migrate\destination;
+
+use Drupal\migrate\Entity\MigrationInterface;
+use Drupal\user\UserData as UserDataStorage;
+use Drupal\migrate\Row;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
+
+/**
+ * @MigrateDestination(
+ *   id = "user_data"
+ * )
+ */
+class UserData extends DestinationBase implements ContainerFactoryPluginInterface {
+
+  /**
+   * @var \Drupal\user\UserData
+   */
+  protected $userData;
+
+  /**
+   * Builds an user data entity destination.
+   *
+   * @param array $configuration
+   *   A configuration array containing information about the plugin instance.
+   * @param string $plugin_id
+   *   The plugin_id for the plugin instance.
+   * @param mixed $plugin_definition
+   *   The plugin implementation definition.
+   * @param \Drupal\migrate\Entity\MigrationInterface $migration
+   *   The migration.
+   * @param \Drupal\user\UserData $user_data
+   *   The user data service.
+   */
+  public function __construct(array $configuration, $plugin_id, $plugin_definition, MigrationInterface $migration, UserDataStorage $user_data) {
+    parent::__construct($configuration, $plugin_id, $plugin_definition, $migration);
+    $this->userData = $user_data;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition, MigrationInterface $migration = NULL) {
+    return new static(
+      $configuration,
+      $plugin_id,
+      $plugin_definition,
+      $migration,
+      $container->get('user.data')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function import(Row $row, array $old_destination_id_values = array()) {
+    $uid = $row->getDestinationProperty('uid');
+    $this->userData->set($row->getDestinationProperty('module'), $uid, $row->getDestinationProperty('key'), $row->getDestinationProperty('settings'));
+    return [$uid];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getIds() {
+    $ids['uid']['type'] = 'integer';
+    $ids['module']['type'] = 'string';
+    $ids['key']['type'] = 'string';
+    return $ids;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function fields(MigrationInterface $migration = NULL) {
+    return [
+      'uid' => 'The user id.',
+      'module' => 'The module name responsible for the settings.',
+      'key' => 'The setting key to save under.',
+      'settings' => 'The settings to save.',
+    ];
+  }
+
+}
diff --git a/core/modules/migrate_drupal/config/install/migrate.migration.d6_user_contact_settings.yml b/core/modules/migrate_drupal/config/install/migrate.migration.d6_user_contact_settings.yml
new file mode 100644
index 0000000..87849d8
--- /dev/null
+++ b/core/modules/migrate_drupal/config/install/migrate.migration.d6_user_contact_settings.yml
@@ -0,0 +1,20 @@
+id: d6_user_contact_settings
+label: Drupal 6 user contact settings
+migration_groups:
+  - Drupal 6
+source:
+  plugin: d6_user
+  constants:
+    key: contact
+    module: contact
+process:
+  uid: uid
+  settings: 'data/contact'
+  key: 'constants/key'
+  module: 'constants/module'
+
+destination:
+  plugin: user_data
+migration_dependencies:
+  required:
+    - d6_user
diff --git a/core/modules/migrate_drupal/src/Plugin/migrate/source/d6/User.php b/core/modules/migrate_drupal/src/Plugin/migrate/source/d6/User.php
index 333765a..568629b 100644
--- a/core/modules/migrate_drupal/src/Plugin/migrate/source/d6/User.php
+++ b/core/modules/migrate_drupal/src/Plugin/migrate/source/d6/User.php
@@ -76,6 +76,9 @@ public function prepareRow(Row $row) {
       }
     }
 
+    // Unserialize Data.
+    $row->setSourceProperty('data', unserialize($row->getSourceProperty('data')));
+
     return parent::prepareRow($row);
   }
 
@@ -113,6 +116,7 @@ protected function baseFields() {
       'language' => $this->t('Language'),
       'picture' => $this->t('Picture'),
       'init' => $this->t('Init'),
+      'data' => $this->t('User data'),
     );
 
     // Possible field added by Date contributed module.
diff --git a/core/modules/migrate_drupal/src/Tests/Dump/Drupal6User.php b/core/modules/migrate_drupal/src/Tests/Dump/Drupal6User.php
index ba706dd..f61e472 100644
--- a/core/modules/migrate_drupal/src/Tests/Dump/Drupal6User.php
+++ b/core/modules/migrate_drupal/src/Tests/Dump/Drupal6User.php
@@ -321,7 +321,7 @@ public static function getData($table) {
           'timezone' => '3600',
           'language' => 'fr',
           'init' => 'doe@example.com',
-          'data' => serialize(array()),
+          'data' => serialize(array('contact' => 1)),
           'timezone_name' => NULL,
           'timezone_id' => 1,
           'pass_plain' => 'john.doe_pass',
@@ -346,7 +346,7 @@ public static function getData($table) {
           'timezone' => '7200',
           'language' => 'ro',
           'init' => 'roe@example.com',
-          'data' => serialize(array()),
+          'data' => serialize(array('contact' => 0)),
           'timezone_name' => 'Europe/Helsinki',
           'timezone_id' => 0,
           'pass_plain' => 'joe.roe_pass',
diff --git a/core/modules/migrate_drupal/src/Tests/d6/MigrateUserContactSettingsTest.php b/core/modules/migrate_drupal/src/Tests/d6/MigrateUserContactSettingsTest.php
new file mode 100644
index 0000000..621cd2c
--- /dev/null
+++ b/core/modules/migrate_drupal/src/Tests/d6/MigrateUserContactSettingsTest.php
@@ -0,0 +1,67 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\migrate_drupal\Tests\d6\MigrateUserContactSettingsTest.
+ */
+
+namespace Drupal\migrate_drupal\Tests\d6;
+
+use Drupal\Core\Database\Database;
+use Drupal\migrate\MigrateExecutable;
+use Drupal\migrate_drupal\Tests\MigrateDrupalTestBase;
+
+/**
+ * Users contact settings migration.
+ *
+ * @group migrate_drupal
+ */
+class MigrateUserContactSettingsTest extends MigrateDrupalTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    $dumps = array(
+      $this->getDumpDirectory() . '/Drupal6User.php',
+    );
+    $this->loadDumps($dumps);
+
+    $id_mappings = array(
+      'd6_user' => array(
+        array(array(2), array(2)),
+        array(array(8), array(8)),
+        array(array(15), array(15)),
+      ),
+    );
+
+    $this->prepareMigrations($id_mappings);
+
+    // Migrate users.
+    $migration = entity_load('migration', 'd6_user_contact_settings');
+    $executable = new MigrateExecutable($migration, $this);
+    $executable->import();
+  }
+
+  /**
+   * Tests the Drupal6 user contact settings migration.
+   */
+  public function testUserContactSettings() {
+    $user_data = \Drupal::service('user.data');
+    $module = $key = 'contact';
+    $uid = 2;
+    $setting = $user_data->get($module, $uid, $key);
+    $this->assertIdentical($setting, '1');
+
+    $uid = 8;
+    $setting = $user_data->get($module, $uid, $key);
+    $this->assertIdentical($setting, '0');
+
+    $uid = 15;
+    $setting = $user_data->get($module, $uid, $key);
+    $this->assertIdentical($setting, NULL);
+  }
+
+}