diff --git a/lib/group.php b/lib/group.php
index ceee5fa4ed..fb280c157e 100644
--- a/lib/group.php
+++ b/lib/group.php
@@ -271,4 +271,17 @@ class OC_Group {
 		}
 		return $users;
 	}
+	
+	/**
+	 * @brief get a list of all users in several groups
+	 * @param array $gids
+	 * @returns array with user ids
+	 */
+	public static function usersInGroups($gids){
+		$users = array();
+		foreach($gids as $gid){
+			$users = array_merge(array_diff(self::usersInGroup($gid), $users), $users);
+		}
+		return $users;
+	}
 }
diff --git a/lib/subadmin.php b/lib/subadmin.php
new file mode 100644
index 0000000000..aad657b024
--- /dev/null
+++ b/lib/subadmin.php
@@ -0,0 +1,107 @@
+<?php
+/**
+ * ownCloud
+ *
+ * @author Georg Ehrke
+ * @copyright 2012 Georg Ehrke 
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU AFFERO GENERAL PUBLIC LICENSE for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public
+ * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+/**
+ * This class provides all methods needed for managing groups.
+ *
+ * Hooks provided:
+ *   post_createSubAdmin($gid)
+ *   post_deleteSubAdmin($gid)
+ */
+class OC_SubAdmin{
+
+	/**
+	 * @brief add a SubAdmin
+	 * @param $uid uid of the SubAdmin
+	 * @param $gid gid of the group
+	 * @return boolean
+	 */
+	public static function createSubAdmin($uid, $gid){
+		$stmt = OC_DB::prepare('INSERT INTO *PREFIX*group_admin (gid,uid) VALUES(?,?)');
+		$result = $stmt->execute(array($gid, $uid));
+		if(OC_DB::isError($result)){
+			return false;
+		}
+		OC_Hook::emit( "OC_SubAdmin", "post_createSubAdmin", array( "gid" => $gid ));
+		return true;
+	}
+
+	/**
+	 * @brief delete a SubAdmin
+	 * @param $uid uid of the SubAdmin
+	 * @param $gid gid of the group
+	 * @return boolean
+	 */
+	public static function deleteSubAdmin($uid, $gid){
+		$stmt = OC_DB::prepare('DELETE FROM *PREFIX*group_admin WHERE gid = ? AND uid = ?');
+		$result = $stmt->execute(array($gid, $uid));
+		if(OC_DB::isError($result)){
+			return false;
+		}
+		OC_Hook::emit( "OC_SubAdmin", "post_deleteSubAdmin", array( "gid" => $gid ));
+		return true;
+	}
+
+	/**
+	 * @brief get groups of a SubAdmin
+	 * @param $uid uid of the SubAdmin
+	 * @return array
+	 */
+	public static function getSubAdminsGroups($uid){
+		$stmt = OC_DB::prepare('SELECT gid FROM *PREFIX*group_admin WHERE uid = ?');
+		$result = $stmt->execute(array($gid, $uid));
+		$gids = array();
+		while($row = $result->fetchRow()){
+			$gids[] = $row['gid'];
+		}
+		return $gids;
+	}
+
+	/**
+	 * @brief get SubAdmins of a group
+	 * @param $gid gid of the group
+	 * @return array
+	 */
+	public static function getGroupsSubAdmins($gid){
+		$stmt = OC_DB::prepare('SELECT uid FROM *PREFIX*group_admin WHERE gid = ?');
+		$result = $stmt->execute(array($gid, $uid));
+		$uids = array();
+		while($row = $result->fetchRow()){
+			$uids[] = $row['uid'];
+		}
+		return $uids;
+	}
+	
+	/**
+	 * @brief get all SubAdmins
+	 * @return array
+	 */
+	public static function getAllSubAdmins(){
+		$stmt = OC_DB::prepare('SELECT * FROM *PREFIX*group_admin');
+		$result = $stmt->execute(array($gid, $uid));
+		$subadmins = array();
+		while($row = $result->fetchRow()){
+			$subadmins[] = $row;
+		}
+		return $subadmins;
+	}
+}
diff --git a/lib/util.php b/lib/util.php
index 2a7b8a922f..de9171edc8 100755
--- a/lib/util.php
+++ b/lib/util.php
@@ -66,7 +66,7 @@ class OC_Util {
 	 * @return array
 	 */
 	public static function getVersion(){
-		return array(4,80,1);
+		return array(4,81,2);
 	}
 
 	/**
@@ -320,6 +320,26 @@ class OC_Util {
 		}
 	}
 
+	/**
+	* Check if the user is a subadmin, redirects to home if not
+	* @return array $groups where the current user is subadmin
+	*/
+	public static function checkSubAdminUser(){
+		// Check if we are a user
+		self::checkLoggedIn();
+		if(OC_Group::inGroup(OC_User::getUser(),'admin')){
+			return OC_Group::getGroups();
+		}
+		$stmt = OC_DB::prepare('SELECT COUNT(*) as count FROM *PREFIX*group_admin WHERE uid = ?');
+		$result = $stmt->execute(array(OC_User::getUser()));
+		$result = $result->fetchRow();
+		if($result['count'] == 0){
+			header( 'Location: '.OC_Helper::linkToAbsolute( '', 'index.php' ));
+			exit();
+		}
+		return $groups;
+	}
+
 	/**
 	* Redirect to the user default page
 	*/
diff --git a/settings/templates/users.php b/settings/templates/users.php
index 5511242456..b16aa1ae16 100644
--- a/settings/templates/users.php
+++ b/settings/templates/users.php
@@ -1,13 +1,14 @@
-<?php /**
+<?php
+/**
  * Copyright (c) 2011, Robin Appelman <icewind1991@gmail.com>
  * This file is licensed under the Affero General Public License version 3 or later.
  * See the COPYING-README file.
  */
-
 $allGroups=array();
 foreach($_["groups"] as $group) {
 	$allGroups[]=$group['name'];
 }
+$_['subadmingroups'] = $_['groups'];
 ?>
 
 <div id="controls">
@@ -60,6 +61,9 @@ foreach($_["groups"] as $group) {
 			<th id='headerName'><?php echo $l->t('Name')?></th>
 			<th id="headerPassword"><?php echo $l->t( 'Password' ); ?></th>
 			<th id="headerGroups"><?php echo $l->t( 'Groups' ); ?></th>
+			<?php if(is_array($_['subadmins']) || $_['subadmins']): ?>
+			<th id="headerSubAdmins"><?php echo $l->t('SubAdmins'); ?></th>
+			<?php endif;?>
 			<th id="headerQuota"><?php echo $l->t( 'Quota' ); ?></th>
 			<th id="headerRemove">&nbsp;</th>
 		</tr>
@@ -84,6 +88,20 @@ foreach($_["groups"] as $group) {
 					<?php endforeach;?>
 			</select>
 			</td>
+			<?php if(is_array($_['subadmins']) || $_['subadmins']): ?>
+			<td class="subadmins"><select
+				data-username="<?php echo $user['name'] ;?>"
+				data-user-groups="<?php echo $user['groups'] ;?>"
+				data-placeholder="subadmins" title="<?php echo $l->t('SubAdmin for ...')?>"
+				multiple="multiple">
+					<?php foreach($_["subadmingroups"] as $group): ?>
+					<option value="<?php echo $group['name'];?>">
+						<?php echo $group['name'];?>
+					</option>
+					<?php endforeach;?>
+			</select>
+			</td>
+			<?php endif;?>
 			<td class="quota">
 				<div class="quota-select-wrapper">
 					<select class='quota-user'>
diff --git a/settings/users.php b/settings/users.php
index 026a30a750..a6ce94bb5b 100644
--- a/settings/users.php
+++ b/settings/users.php
@@ -6,7 +6,7 @@
  */
 
 require_once('../lib/base.php');
-OC_Util::checkAdminUser();
+OC_Util::checkSubAdminUser();
 
 // We have some javascript foo!
 OC_Util::addScript( 'settings', 'users' );
@@ -17,11 +17,22 @@ OC_App::setActiveNavigationEntry( 'core_users' );
 $users = array();
 $groups = array();
 
-foreach( OC_User::getUsers() as $i ){
-	$users[] = array( "name" => $i, "groups" => join( ", ", OC_Group::getUserGroups( $i ) ),'quota'=>OC_Preferences::getValue($i,'files','quota','default'));
+$isadmin = OC_Group::inGroup(OC_User::getUser(),'admin')?true:false;
+if($isadmin){
+	$groups = OC_Group::getGroups();
+	$accessibleusers = OC_User::getUsers();
+	$subadmins = OC_SubAdmin::getAllSubAdmins();
+}else{
+	$groups = OC_SubAdmin::getSubAdminsGroups(OC_User::getUser());
+	$accessibleusers = OC_Group::usersInGroups($groups);
+	$subadmins = false;
 }
 
-foreach( OC_Group::getGroups() as $i ){
+foreach($accessibleusers as $i){
+	$users[] = array( "name" => $i, "groups" => join( ", ", /*array_intersect(*/OC_Group::getUserGroups($i)/*, OC_SubAdmin::getSubAdminsGroups(OC_User::getUser()))*/),'quota'=>OC_Preferences::getValue($i,'files','quota','default'));
+}
+
+foreach( $groups as $i ){
 	// Do some more work here soon
 	$groups[] = array( "name" => $i );
 }
@@ -44,10 +55,8 @@ if (\OC_App::isEnabled( "files_sharing" ) ) {
 $tmpl = new OC_Template( "settings", "users", "user" );
 $tmpl->assign( "users", $users );
 $tmpl->assign( "groups", $groups );
+$tmpl->assign( 'subadmins', $subadmins);
 $tmpl->assign( 'quota_preset', $quotaPreset);
 $tmpl->assign( 'default_quota', $defaultQuota);
 $tmpl->assign( 'share_notice', $shareNotice);
-$tmpl->printPage();
-
-?>
-
+$tmpl->printPage();
\ No newline at end of file