diff --git a/htdocs/user/class/api_users.class.php b/htdocs/user/class/api_users.class.php
index 3b7d7ee5b00..3dff0d02f15 100644
--- a/htdocs/user/class/api_users.class.php
+++ b/htdocs/user/class/api_users.class.php
@@ -17,7 +17,8 @@
 
 use Luracast\Restler\RestException;
 
-//require_once DOL_DOCUMENT_ROOT . '/contact/class/contact.class.php';
+require_once DOL_DOCUMENT_ROOT.'/user/class/user.class.php';
+require_once DOL_DOCUMENT_ROOT.'/user/class/usergroup.class.php';
 
 /**
  * API class for users
@@ -231,6 +232,41 @@ class Users extends DolibarrApi
 		}
     }
 
+
+	/**
+	 * List the groups of a user
+	 *
+	 * @param int $id     Id of user
+	 * @return array      Array of group objects
+	 *
+	 * @throws RestException
+	 *
+	 * @url GET {id}/groups
+	 */
+	function getGroups($id)
+	{
+		$obj_ret = array();
+
+		if (! DolibarrApiAccess::$user->rights->user->user->lire) {
+			throw new RestException(401);
+		}
+
+		$user = new User($this->db);
+		$result = $user->fetch($id);
+		if( ! $result ) {
+			throw new RestException(404, 'user not found');
+		}
+
+		$usergroup = new UserGroup($this->db);
+		$groups = $usergroup->listGroupsForUser($id, false);
+		$obj_ret = array();
+		foreach ($groups as $group) {
+			$obj_ret[] = $this->_cleanObjectDatas($group);
+		}
+		return $obj_ret;
+	}
+
+
     /**
 	 * Add a user into a group
 	 *