diff --git a/packages/jquery/plugins/jquery.select2.selectAll.js b/packages/jquery/plugins/jquery.select2.selectAll.js
new file mode 100644
index 000000000..f53f0c684
--- /dev/null
+++ b/packages/jquery/plugins/jquery.select2.selectAll.js
@@ -0,0 +1,92 @@
+/**
+ * jquery.select2.selectAll.js
+ * 
+ * A Select2 extension that adds "Select All" and "Unselect All" functionality to Select2 dropdowns.
+ *
+ * @description
+ * This extension creates a custom adapter for Select2 that adds "Select All" and "Unselect All"
+ * buttons to the dropdown of multi-select Select2 instances. These buttons allow users to quickly
+ * select or unselect all options in the dropdown.
+ *
+ * @usage
+ * 1. Include this file after loading jQuery and Select2.
+ * 2. Initialize Select2 with the custom adapter:
+ *  $('#your-select-element').select2({
+ *    dropdownAdapter: $.fn.select2.amd.require('select2/selectAllAdapter')
+ *  });
+ *
+ * @dependencies
+ * - jQuery (https://jquery.com)
+ * - Select2 (https://select2.org)
+ *
+ * @source
+ * This script is based on the code from:
+ * https://jsfiddle.net/beaver71/tjvjytp3/
+ * Modified and packaged as a reusable extension.
+ * The original code was written for Select2 version 4.0.5. When adapting it for the latest version
+ * (4.1.0-rc.0), some modifications were necessary due to changes in Select2's internal structure
+ * and API. The custom adapter code has been updated to be compatible with version 4.1.0-rc.0,
+ * addressing issues that arose from differences in how Select2 handles custom adapters in the
+ * newer version. These changes ensure that the "Select All" and "Unselect All" functionality
+ * works correctly with the latest Select2 release while maintaining backwards compatibility
+ * where possible.
+ */
+
+(function ($) {
+  'use strict';
+
+  $.fn.select2.amd.define('select2/selectAllAdapter', [
+    'select2/utils',
+    'select2/dropdown',
+    'select2/dropdown/attachBody'
+  ], function (Utils, Dropdown, AttachBody) {
+
+  function SelectAll() { }
+  SelectAll.prototype.render = function (decorated) {
+    var self = this,
+      $rendered = decorated.call(this),
+      $selectAll = $(
+        '<button class="btn btn-xs btn-default" type="button" style="margin-left:6px;"><i class="fa fa-check-square-o"></i> Select All</button>'
+      ),
+      $unselectAll = $(
+        '<button class="btn btn-xs btn-default" type="button" style="margin-left:6px;"><i class="fa fa-square-o"></i> Unselect All</button>'
+      ),
+      $btnContainer = $('<div style="margin-top:3px;">').append($selectAll).append($unselectAll);
+    if (!this.$element.prop("multiple")) {
+      // This isn't a multi-select, don't add the buttons
+      return $rendered;
+    }
+    $rendered.find('.select2-dropdown').prepend($btnContainer);
+    $selectAll.on('click', function (e) {
+      e.preventDefault();
+      var $options = self.$element.find('option');
+      var values = [];
+
+      $options.each(function() {
+        if (!this.disabled) {
+          values.push(this.value);
+        }
+      });
+
+      self.$element.val(values);
+      self.$element.trigger('change');
+      self.trigger('close');
+    });
+    $unselectAll.on('click', function (e) {
+      e.preventDefault();
+      self.$element.val([]);
+      self.$element.trigger('change');
+      self.trigger('close');
+    });
+    return $rendered;
+  };
+
+  return Utils.Decorate(
+    Utils.Decorate(
+      Dropdown,
+      AttachBody
+    ),
+    SelectAll
+  );
+  });
+})(jQuery);
\ No newline at end of file
diff --git a/templates/CRM/common/jquery.files.tpl b/templates/CRM/common/jquery.files.tpl
index 784cea274..958fe3e03 100644
--- a/templates/CRM/common/jquery.files.tpl
+++ b/templates/CRM/common/jquery.files.tpl
@@ -71,6 +71,7 @@ packages/jquery/plugins/jquery.chosen.js
 packages/jquery/css/jquery.chosen.css
 
 packages/jquery/plugins/jquery.select2.js
+packages/jquery/plugins/jquery.select2.selectAll.js
 packages/jquery/css/jquery.select2.css
 
 packages/jquery/plugins/jquery.modal.min.js
diff --git a/templates/CRM/common/select2.tpl b/templates/CRM/common/select2.tpl
index 20300a307..cde9bf2cd 100644
--- a/templates/CRM/common/select2.tpl
+++ b/templates/CRM/common/select2.tpl
@@ -1,14 +1,25 @@
 {if !$nowrapper}<script type="text/javascript"> {/if}
 {literal}
 (function ($) {
-cj(document).ready(function(){
-  $('{/literal}{$selector}{literal}').select2({
-    "allowClear": true,
-    "dropdownAutoWidth": true,
-    {/literal}{if $select_width}"width": "{$select_width}",{/if}{literal}
-    "placeholder": "{/literal}{ts}-- Select --{/ts}{literal}",
-    "language": "{/literal}{if $config->lcMessages}{$config->lcMessages|replace:'_':'-'}{else}en{/if}{literal}"
+$(document).ready(function(){
+  let $elements = $('{/literal}{$selector}{literal}');
+  $elements.each(function() {
+    let $this = $(this);
+    let options = {
+      "allowClear": true,
+      "dropdownAutoWidth": true,
+      {/literal}{if $select_width}"width": "{$select_width}",{/if}{literal}
+      "placeholder": "{/literal}{ts}-- Select --{/ts}{literal}",
+      "language": "{/literal}{if $config->lcMessages}{$config->lcMessages|replace:'_':'-'}{else}en{/if}{literal}"
+    };
+
+    if ($this.is('select[multiple]')) {
+      options.dropdownAdapter = $.fn.select2.amd.require('select2/selectAllAdapter');
+    }
+
+    $this.select2(options);
   });
+
   $(document).on('select2:open select2:close', (e) => {
     let thisSelect = e.target,
         $thisSelect = $(thisSelect),