diff --git a/core/modules/content_translation/content_translation.pages.inc b/core/modules/content_translation/content_translation.pages.inc
index ac36ff7..5d3f57d 100644
--- a/core/modules/content_translation/content_translation.pages.inc
+++ b/core/modules/content_translation/content_translation.pages.inc
@@ -30,11 +30,10 @@ function content_translation_overview(EntityInterface $entity) {
     $rel[$name] = $entity->getSystemPath($name);
   }
 
-  $header = array(t('Language'), t('Translation'), t('Source language'), t('Status'), t('Operations'));
+  $header = array(t('Language'), t('Translation'), t('Status'), t('Operations'));
   $rows = array();
 
   if (\Drupal::languageManager()->isMultilingual()) {
-
     // Determine whether the current entity is translatable.
     $translatable = FALSE;
     foreach (field_info_instances($entity->getEntityTypeId(), $entity->bundle()) as $instance) {
@@ -44,6 +43,24 @@ function content_translation_overview(EntityInterface $entity) {
       }
     }
 
+    // Collect source languages for translations (non-originals).
+    $language_as_source = array();
+    foreach ($languages as $language) {
+      $langcode = $language->id;
+      $is_original = $langcode == $original;
+      if (!$is_original && isset($translations[$langcode])) {
+        $source = isset($entity->translation[$langcode]['source']) ? $entity->translation[$langcode]['source'] : '';
+        $language_as_source[$source] = TRUE;
+      }
+    }
+
+    // Add the source-translation column if there is more than one source value.
+    $show_source_column = count($language_as_source) > 1;
+
+    if ($show_source_column) {
+      $header = array(t('Language'), t('Translation'), t('Source language'), t('Status'), t('Operations'));
+    }
+
     foreach ($languages as $language) {
       $language_name = $language->name;
       $langcode = $language->id;
@@ -125,7 +142,12 @@ function content_translation_overview(EntityInterface $entity) {
         $status = t('Not translated');
       }
 
-      $rows[] = array($language_name, $row_title, $source_name, $status, $operations);
+      if ($show_source_column) {
+        $rows[] = array($language_name, $row_title, $source_name, $status, $operations);
+      }
+      else {
+        $rows[] = array($language_name, $row_title, $status, $operations);
+      }
     }
   }
 
diff --git a/core/modules/content_translation/lib/Drupal/content_translation/Tests/ContentTranslationUITest.php b/core/modules/content_translation/lib/Drupal/content_translation/Tests/ContentTranslationUITest.php
index 0816fce..854db9b 100644
--- a/core/modules/content_translation/lib/Drupal/content_translation/Tests/ContentTranslationUITest.php
+++ b/core/modules/content_translation/lib/Drupal/content_translation/Tests/ContentTranslationUITest.php
@@ -36,6 +36,7 @@
   function testTranslationUI() {
     $this->doTestBasicTranslation();
     $this->doTestTranslationOverview();
+    $this->doTestSourceLanguageColumn();
     $this->doTestOutdatedStatus();
     $this->doTestPublishedStatus();
     $this->doTestAuthoringInfo();
@@ -116,6 +117,56 @@ protected function doTestTranslationOverview() {
   }
 
   /**
+   * Tests that the "Source language" column is shown only when needed.
+   *
+   * The "Source language" column should only be shown when an entity has
+   * translations that derive from at least two source languages.
+   */
+  protected function doTestSourceLanguageColumn() {
+    // Create a new test entity with original values in the default language.
+    $default_langcode = $this->langcodes[0];
+    $values[$default_langcode] = $this->getNewEntityValues($default_langcode);
+    $entityId = $this->createEntity($values[$default_langcode], $default_langcode);
+    $entity = entity_load($this->entityTypeId, $entityId, TRUE);
+    $this->assertTrue($entity, 'Entity found in the database.');
+    $this->drupalGet($entity->getSystemPath());
+    $this->assertResponse(200, 'Entity URL is valid.');
+
+    // If all content is written from scratch in various languages then source
+    // language column should be hidden.
+    $this->drupalGet($entity->getSystemPath('drupal:content-translation-overview'));
+    $this->assertNoText('Source language', format_string('Source language column correctly hidden.'));
+
+    // Create a number of content translations from scratch, so not based on a
+    // currently existing entity in a different source language.
+    $langcode = 'fr';
+    $values[$langcode] = $this->getNewEntityValues($langcode);
+    $content_translation_path = $entity->getSystemPath('drupal:content-translation-overview');
+    $path = $langcode . '/' . $content_translation_path . '/add/' . $default_langcode . '/' . $langcode;
+    $this->drupalPostForm($path, $this->getEditValues($values, $langcode), $this->getFormSubmitAction($entity));
+    $entity = entity_load($this->entityTypeId, $entityId, TRUE);
+
+    // If at most one translated version of an entity is derived from a version
+    // of it in another language, then Source language column should be hidden.
+    $this->drupalGet($entity->getSystemPath('drupal:content-translation-overview'));
+    $this->assertNoText('Source language', format_string('Source language column correctly hidden.'));
+
+    // Create a new translation based on another source language.
+    $langcode = 'it';
+    $values[$langcode] = $this->getNewEntityValues($langcode);
+    $source_langcode = 'fr';
+    $path = $langcode . '/' . $content_translation_path . '/add/' . $source_langcode . '/' . $langcode;
+    $this->drupalPostForm($path, $this->getEditValues($values, $langcode), $this->getFormSubmitAction($entity));
+    $entity = entity_load($this->entityTypeId, $entityId, TRUE);
+
+    // If two or more translated versions of an entity are derived from any
+    // version of it in another language, then Source language column should be
+    // shown.
+    $this->drupalGet($entity->getSystemPath('drupal:content-translation-overview'));
+    $this->assertText('Source language', format_string('Source language column correctly shown.'));
+  }
+
+  /**
    * Tests up-to-date status tracking.
    */
   protected function doTestOutdatedStatus() {