diff -u b/core/modules/comment/comment.module b/core/modules/comment/comment.module
--- b/core/modules/comment/comment.module
+++ b/core/modules/comment/comment.module
@@ -1231,10 +1231,25 @@
     $parent = $comment->getParentComment();
     if ($parent && $parent->isPublished()) {
       $build = comment_view($parent);
-      $preview_build['comment_output_below'] = $build;
     }
   }
+  else {
+    // The comment field output includes rendering the parent entity of the
+    // thread to which the comment is a reply. The rendered entity output
+    // includes the comment reply form, which contains the comment preview and
+    // therefore the rendered parent entity. This results in an infinite loop of
+    // parent entity output rendering the comment form and the comment form
+    // rendering the parent entity. To prevent this infinite loop we temporarily
+    // set the value of the comment field on a clone of the entity to hidden
+    // before calling entity_view(). That way when the output of the commented
+    // entity is rendered, it excludes the comment field output.
+    $field_name = $comment->getFieldName();
+    $entity = clone $entity;
+    $entity->$field_name->status = CommentItemInterface::HIDDEN;
+    $build = entity_view($entity, 'full');
+  }
 
+  $preview_build['comment_output_below'] = $build;
   $preview_build['comment_output_below']['#weight'] = 100;
 
   return $preview_build;
diff -u b/core/modules/comment/lib/Drupal/comment/Controller/CommentController.php b/core/modules/comment/lib/Drupal/comment/Controller/CommentController.php
--- b/core/modules/comment/lib/Drupal/comment/Controller/CommentController.php
+++ b/core/modules/comment/lib/Drupal/comment/Controller/CommentController.php
@@ -246,6 +246,17 @@
         // Display the parent comment.
         $build['comment_parent'] = $this->entityManager()->getViewBuilder('comment')->view($comment);
       }
+
+      // The comment is in response to a entity.
+      elseif ($entity->access('view', $account)) {
+        // We make sure the field value isn't set so we don't end up with a
+        // redirect loop.
+        $entity = clone $entity;
+        $entity->{$field_name}->status = CommentItemInterface::HIDDEN;
+        // Render array of the entity full view mode.
+        $build['commented_entity'] = $this->entityManager()->getViewBuilder($entity->getEntityTypeId())->view($entity, 'full');
+        unset($build['commented_entity']['#cache']);
+      }
     }
     else {
       $build['#title'] = $this->t('Preview comment');
reverted:
--- b/core/modules/node/lib/Drupal/node/Tests/NodeTitleTest.php
+++ a/core/modules/node/lib/Drupal/node/Tests/NodeTitleTest.php
@@ -59,6 +59,9 @@
     $xpath = '//nav[@class="breadcrumb"]/ol/li[last()]/a';
     $this->assertEqual(current($this->xpath($xpath)), $node->label(), 'Node breadcrumb is equal to node title.', 'Node');
 
+    // Test node title in comment preview.
+    $this->assertEqual(current($this->xpath('//article[@id=:id]/h2/a/span', array(':id' => 'node-' . $node->id()))), $node->label(), 'Node preview title is equal to node title.', 'Node');
+
     // Test node title is clickable on teaser list (/node).
     $this->drupalGet('node');
     $this->clickLink($node->label());