diff -u b/src/Feeds/Target/Language.php b/src/Feeds/Target/Language.php
--- b/src/Feeds/Target/Language.php
+++ b/src/Feeds/Target/Language.php
@@ -3,7 +3,8 @@
 namespace Drupal\feeds\Feeds\Target;
 
 use Drupal\feeds\Plugin\Type\Target\FieldTargetBase;
-
+use Drupal\feeds\FeedInterface;
+use Drupal\Core\Entity\EntityInterface;
 
 /**
  * Defines a language field mapper.
@@ -20,8 +21,13 @@
   /**
    * {@inheritdoc}
    */
-  protected function prepareValue($delta, array &$values) {
-    // TODO: validate and format if neccessary
+  public function setTarget(FeedInterface $feed, EntityInterface $entity, $field_name, array $values) {
+    if ($values = $this->prepareValues($values)) {
+      $langcode = isset($values[0]['value']) ? $values[0]['value'] : NULL;
+      if (!empty($langcode)) {
+        $entity->set($field_name, $langcode);
+      }
+    }
   }
 
 }
only in patch2:
unchanged:
--- /dev/null
+++ b/tests/resources/csv/content_language.csv
@@ -0,0 +1,3 @@
+"guid","title","langcode"
+1,"Lorem ipsum",und
+2,"Ut wisi enim ad minim veniam",es
only in patch2:
unchanged:
--- /dev/null
+++ b/tests/src/Kernel/Feeds/Target/LanguageTest.php
@@ -0,0 +1,83 @@
+<?php
+
+namespace Drupal\Tests\feeds\Kernel\Feeds\Target;
+
+use Drupal\node\Entity\Node;
+use Drupal\Tests\feeds\Kernel\FeedsKernelTestBase;
+
+/**
+ * @coversDefaultClass \Drupal\feeds\Feeds\Target\Language
+ * @group feeds
+ */
+class LanguageTest extends FeedsKernelTestBase {
+
+  /**
+   * The feed type.
+   *
+   * @var \Drupal\feeds\FeedTypeInterface
+   */
+  protected $feedType;
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = [
+    'field',
+    'node',
+    'feeds',
+    'text',
+    'filter',
+    'language',
+  ];
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setUp() {
+    parent::setUp();
+
+    $language = $this->container->get('entity.manager')->getStorage('configurable_language')->create([
+      'id' => 'es',
+    ]);
+    $language->save();
+
+    // Create feed type.
+    $this->feedType = $this->createFeedTypeForCsv([
+      'guid',
+      'title',
+      'langcode',
+    ]);
+  }
+
+  /**
+   * Tests importing a content with a specific language.
+   */
+  public function testImportLanguage() {
+    $this->feedType->addMapping([
+      'target' => 'langcode',
+      'map' => ['value' => 'langcode'],
+    ]);
+    $this->feedType->save();
+
+    // Import.
+    $feed = $this->createFeed($this->feedType->id(), [
+      'source' => $this->resourcesPath() . '/csv/content_language.csv',
+    ]);
+    $feed->import();
+
+    // Assert three created nodes.
+    $this->assertNodeCount(2);
+
+    $expected = [
+      1 => 'und',
+      2 => 'es',
+    ];
+    foreach ($expected as $nid => $value) {
+      $node = Node::load($nid);
+      $this->assertEquals($value, $node->langcode->value);
+    }
+  }
+
+}