diff --git includes/common.inc includes/common.inc
index 1fb535f..1982aa6 100644
--- includes/common.inc
+++ includes/common.inc
@@ -3740,7 +3740,7 @@ function drupal_render_page($page) {
  * Recursively iterates over each of the array elements, generating HTML code.
  *
  * HTML generation is controlled by two properties containing theme functions,
- * #theme and #theme_wrapper.
+ * #theme and #theme_wrappers.
  *
  * #theme is the theme function called first. If it is set and the element has
  * any children, they have to be rendered there. For elements that are not
@@ -3749,21 +3749,22 @@ function drupal_render_page($page) {
  * children, they are rendered and concatenated into a string by
  * drupal_render_children().
  *
- * The theme function in #theme_wrapper will be called after #theme has run.
- * It can be used to add further markup around the rendered children, e.g.
- * fieldsets add the required markup for a fieldset around their rendered
- * child elements.  A wrapper theme function always has to include the
- * element's #children property in its output, as this contains the rendered
+ * The #theme_wrappers property contains an array of theme functions which will
+ * be called, in order, after #theme has run. These can be used to add further
+ * markup around the rendered children; e.g., fieldsets add the required markup
+ * for a fieldset around their rendered child elements. All wrapper theme
+ * functions have to include the element's #children property in their output,
+ * as it contains the output of the previous theme functions and the rendered
  * children.
  *
- * For example, for the form element type, by default only the #theme_wrapper
+ * For example, for the form element type, by default only the #theme_wrappers
  * property is set, which adds the form markup around the rendered child
  * elements of the form. This allows you to set the #theme property on a
  * specific form to a custom theme function, giving you complete control over
  * the placement of the form's children while not at all having to deal with
  * the form markup itself.
  *
- * This function is usually called from within a another function, like
+ * This function is usually called from within another function, like
  * drupal_get_form() or a theme function. Elements are sorted internally
  * using uasort(). Since this is expensive, when passing already sorted
  * elements to drupal_render(), for example from a database query, set
@@ -3826,10 +3827,12 @@ function drupal_render(&$elements) {
     $elements['#children'] = drupal_render_children($elements, $children);
   }
 
-  // Let the theme function in #theme_wrapper add markup around the rendered
+  // Let the theme functions in #theme_wrappers add markup around the rendered
   // children.
-  if (!empty($elements['#theme_wrapper'])) {
-    $elements['#children'] = theme($elements['#theme_wrapper'], $elements);
+  if (isset($elements['#theme_wrappers'])) {
+    foreach ($elements['#theme_wrappers'] as $theme_wrapper) {
+      $elements['#children'] = theme($theme_wrapper, $elements);
+    }
   }
 
   // Filter the outputted content and make any last changes before the
diff --git includes/form.inc includes/form.inc
index 2c273ac..9c52bd9 100644
--- includes/form.inc
+++ includes/form.inc
@@ -1930,7 +1930,7 @@ function form_process_text_format($element) {
     unset($element['value']['#description']);
     $element['#type'] = 'markup';
     $element['#theme'] = NULL;
-    $element['#theme_wrapper'] = 'text_format_wrapper';
+    $element['#theme_wrappers'] = array('text_format_wrapper');
     $element['format'] = filter_form($element['#text_format'], 1, $element_parents);
 
     // We need to clear the #text_format from the new child otherwise we
@@ -2099,14 +2099,14 @@ function theme_checkboxes($element) {
 }
 
 /**
- * Add form_element theming to an element if title or desription is set.
+ * Add form_element theming to an element if title or description is set.
  *
  * This is used as a pre render function for checkboxes and radios.
  */
 function form_pre_render_conditional_form_element($element) {
   if ($element['#title'] || $element['#description']) {
     unset($element['#id']);
-    $element['#theme_wrapper'] = 'form_element';
+    $element['#theme_wrappers'][] = 'form_element';
   }
   return $element;
 }
@@ -2365,7 +2365,7 @@ function form_process_vertical_tabs($element, &$form_state) {
   // that manually.
   $element['group'] = array(
     '#type' => 'fieldset',
-    '#theme_wrapper' => '',
+    '#theme_wrappers' => array(),
     '#parents' => $element['#parents'],
   );
 
diff --git modules/block/block.module modules/block/block.module
index a50bc72..84b8f13 100644
--- modules/block/block.module
+++ modules/block/block.module
@@ -274,7 +274,7 @@ function block_get_blocks_by_region($region) {
       $build[$key] = $block->content;
       unset($block->content);
       $build[$key] += array(
-        '#theme_wrapper' => 'block',
+        '#theme_wrappers' => array('block'),
         '#block' => $block,
         '#weight' => ++$weight,
       );
diff --git modules/field/modules/text/text.module modules/field/modules/text/text.module
index 7bf1c7b..3098dd4 100644
--- modules/field/modules/text/text.module
+++ modules/field/modules/text/text.module
@@ -508,21 +508,21 @@ function text_elements() {
       '#input' => TRUE,
       '#columns' => array('value'), '#delta' => 0,
       '#process' => array('text_textfield_elements_process'),
-      '#theme_wrapper' => 'text_textfield',
+      '#theme_wrappers' => array('text_textfield'),
       '#autocomplete_path' => FALSE,
     ),
     'text_textarea' => array(
       '#input' => TRUE,
       '#columns' => array('value', 'format'), '#delta' => 0,
       '#process' => array('text_textarea_elements_process'),
-      '#theme_wrapper' => 'text_textarea',
+      '#theme_wrappers' => array('text_textarea'),
       '#filter_value' => FILTER_FORMAT_DEFAULT,
     ),
     'text_textarea_with_summary' => array(
       '#input' => TRUE,
       '#columns' => array('value', 'format', 'summary'), '#delta' => 0,
       '#process' => array('text_textarea_with_summary_process'),
-      '#theme_wrapper' => 'text_textarea_with_summary',
+      '#theme_wrappers' => array('text_textarea_with_summary'),
       '#filter_value' => FILTER_FORMAT_DEFAULT,
     ),
   );
diff --git modules/system/system.module modules/system/system.module
index 5e292b1..4ba649b 100644
--- modules/system/system.module
+++ modules/system/system.module
@@ -255,7 +255,7 @@ function system_elements() {
   $type['form'] = array(
     '#method' => 'post',
     '#action' => request_uri(),
-    '#theme_wrapper' => 'form',
+    '#theme_wrappers' => array('form'),
   );
 
   $type['page'] = array(
@@ -280,7 +280,7 @@ function system_elements() {
     '#button_type' => 'submit',
     '#executes_submit_callback' => TRUE,
     '#process' => array('form_process_ahah'),
-    '#theme_wrapper' => 'button',
+    '#theme_wrappers' => array('button'),
   );
 
   $type['button'] = array(
@@ -289,7 +289,7 @@ function system_elements() {
     '#button_type' => 'submit',
     '#executes_submit_callback' => FALSE,
     '#process' => array('form_process_ahah'),
-    '#theme_wrapper' => 'button',
+    '#theme_wrappers' => array('button'),
   );
 
   $type['image_button'] = array(
@@ -300,7 +300,7 @@ function system_elements() {
     '#return_value' => TRUE,
     '#has_garbage_value' => TRUE,
     '#src' => NULL,
-    '#theme_wrapper' => 'image_button',
+    '#theme_wrappers' => array('image_button'),
   );
 
   $type['textfield'] = array(
@@ -310,7 +310,7 @@ function system_elements() {
     '#autocomplete_path' => FALSE,
     '#process' => array('form_process_text_format', 'form_process_ahah'),
     '#theme' => 'textfield',
-    '#theme_wrapper' => 'form_element',
+    '#theme_wrappers' => array('form_element'),
   );
 
   $type['password'] = array(
@@ -319,13 +319,13 @@ function system_elements() {
     '#maxlength' => 128,
     '#process' => array('form_process_ahah'),
     '#theme' => 'password',
-    '#theme_wrapper' => 'form_element',
+    '#theme_wrappers' => array('form_element'),
   );
 
   $type['password_confirm'] = array(
     '#input' => TRUE,
     '#process' => array('form_process_password_confirm'),
-    '#theme_wrapper' => 'form_element',
+    '#theme_wrappers' => array('form_element'),
   );
 
   $type['textarea'] = array(
@@ -335,13 +335,13 @@ function system_elements() {
     '#resizable' => TRUE,
     '#process' => array('form_process_text_format', 'form_process_ahah'),
     '#theme' => 'textarea',
-    '#theme_wrapper' => 'form_element',
+    '#theme_wrappers' => array('form_element'),
   );
 
   $type['radios'] = array(
     '#input' => TRUE,
     '#process' => array('form_process_radios'),
-    '#theme_wrapper' => 'radios',
+    '#theme_wrappers' => array('radios'),
     '#pre_render' => array('form_pre_render_conditional_form_element'),
   );
 
@@ -350,7 +350,7 @@ function system_elements() {
     '#default_value' => NULL,
     '#process' => array('form_process_ahah'),
     '#theme' => 'radio',
-    '#theme_wrapper' => 'form_element',
+    '#theme_wrappers' => array('form_element'),
     '#form_element_skip_title' => TRUE,
   );
 
@@ -358,7 +358,7 @@ function system_elements() {
     '#input' => TRUE,
     '#tree' => TRUE,
     '#process' => array('form_process_checkboxes'),
-    '#theme_wrapper' => 'checkboxes',
+    '#theme_wrappers' => array('checkboxes'),
     '#pre_render' => array('form_pre_render_conditional_form_element'),
   );
 
@@ -367,7 +367,7 @@ function system_elements() {
     '#return_value' => 1,
     '#process' => array('form_process_ahah'),
     '#theme' => 'checkbox',
-    '#theme_wrapper' => 'form_element',
+    '#theme_wrappers' => array('form_element'),
     '#form_element_skip_title' => TRUE,
   );
 
@@ -377,7 +377,7 @@ function system_elements() {
     '#multiple' => FALSE,
     '#process' => array('form_process_ahah'),
     '#theme' => 'select',
-    '#theme_wrapper' => 'form_element',
+    '#theme_wrappers' => array('form_element'),
   );
 
   $type['weight'] = array(
@@ -392,14 +392,14 @@ function system_elements() {
     '#element_validate' => array('date_validate'),
     '#process' => array('form_process_date'),
     '#theme' => 'date',
-    '#theme_wrapper' => 'form_element',
+    '#theme_wrappers' => array('form_element'),
   );
 
   $type['file'] = array(
     '#input' => TRUE,
     '#size' => 60,
     '#theme' => 'file',
-    '#theme_wrapper' => 'form_element',
+    '#theme_wrappers' => array('form_element'),
   );
 
   $type['tableselect'] = array(
@@ -418,7 +418,7 @@ function system_elements() {
   $type['item'] = array(
     '#markup' => '',
     '#theme' => 'markup',
-    '#theme_wrapper' => 'form_element',
+    '#theme_wrappers' => array('form_element'),
   );
 
   $type['hidden'] = array(
@@ -442,11 +442,11 @@ function system_elements() {
     '#value' => NULL,
     '#process' => array('form_process_fieldset', 'form_process_ahah'),
     '#pre_render' => array('form_pre_render_fieldset'),
-    '#theme_wrapper' => 'fieldset',
+    '#theme_wrappers' => array('fieldset'),
   );
 
   $type['vertical_tabs'] = array(
-    '#theme_wrapper' => 'vertical_tabs',
+    '#theme_wrappers' => array('vertical_tabs'),
     '#default_tab' => '',
     '#process' => array('form_process_vertical_tabs'),
   );
diff --git modules/user/user.module modules/user/user.module
index 75613bf..1bba8df 100644
--- modules/user/user.module
+++ modules/user/user.module
@@ -867,7 +867,7 @@ function user_search($op = 'search', $keys = NULL, $skip_access_check = FALSE) {
 function user_elements() {
   return array(
     'user_profile_category' => array(
-      '#theme_wrapper' => 'user_profile_category'
+      '#theme_wrappers' => array('user_profile_category')
     ),
     'user_profile_item' => array(
       '#theme' => 'user_profile_item'