diff --git a/youtube.module b/youtube.module
index 3bdd7d8..902362a 100644
--- a/youtube.module
+++ b/youtube.module
@@ -131,7 +131,10 @@ function youtube_field_formatter_info() {
     'youtube_video' => array(
       'label' => t('YouTube video'),
       'field types' => array('youtube'),
-      'settings' => array('youtube_size' => '420x315'), // TODO
+      'settings' => array(
+        'youtube_size' => '420x315',
+        'youtube_autoplay' => variable_get('youtube_autoplay', FALSE),
+      ),
     ),
     // This formatter just displays a thumbnail for your video.
     'youtube_thumbnail' => array(
@@ -158,6 +161,11 @@ function youtube_field_formatter_settings_form($field, $instance, $view_mode, $f
       '#options' => youtube_size_options(),
       '#default_value' => $settings['youtube_size'],
     );
+    $element['youtube_autoplay'] = array(
+      '#type' => 'checkbox',
+      '#title' => t('Autoplay?'),
+      '#default_value' => $settings['youtube_autoplay'],
+    );
   }
 
   if ($display['type'] == 'youtube_thumbnail') {
@@ -189,6 +197,9 @@ function youtube_field_formatter_settings_summary($field, $instance, $view_mode)
     else {
       $summary = t('YouTube video: 450px by 315px');
     }
+    if ($settings['youtube_autoplay']) {
+      $summary .= t('; Autoplay: @autoplay', array('@autoplay' => $settings['youtube_autoplay']));
+    }
     return $summary;
   }
 
@@ -221,6 +232,7 @@ function youtube_field_formatter_view($entity_type, $entity, $field, $instance,
           '#theme' => 'youtube_video',
           '#video_id' => $item['video_id'],
           '#youtube_size' => $display['settings']['youtube_size'],
+          '#youtube_autoplay' => $display['settings']['youtube_autoplay'],
         );
       }
       break;
@@ -340,7 +352,7 @@ function youtube_theme($existing, $type, $theme, $path) {
       'file' => 'youtube.theme.inc',
     ),
     'youtube_video' => array(
-      'variables' => array('video_id' => NULL, 'youtube_size' => NULL),
+      'variables' => array('video_id' => NULL, 'youtube_size' => NULL, 'youtube_autoplay' => NULL),
       'file' => 'youtube.theme.inc',
     ),
   );
diff --git a/youtube.theme.inc b/youtube.theme.inc
index da8e19e..30da74f 100644
--- a/youtube.theme.inc
+++ b/youtube.theme.inc
@@ -10,6 +10,7 @@
 function theme_youtube_video($variables) {
   $id = $variables['video_id'];
   $size = $variables['youtube_size'];
+  $autoplay = $variables['youtube_autoplay'];
 
   // Get YouTube settings.
   $old = variable_get('youtube_old', FALSE);
@@ -29,6 +30,9 @@ function theme_youtube_video($variables) {
   if (!$suggest) {
     $query['rel'] = '0';
   }
+  if ($autoplay) {
+    $query['autoplay'] = '1';
+  }
 
   // Domain changes based on settings.
   $domain = ($privacy) ? 'youtube-nocookie.com' : 'youtube.com';