diff --git a/lib/Gitlab/Api/Users.php b/lib/Gitlab/Api/Users.php
index 9ed022d99..a3e31ff5c 100644
--- a/lib/Gitlab/Api/Users.php
+++ b/lib/Gitlab/Api/Users.php
@@ -17,6 +17,17 @@ public function all($active = null, $page = 1, $per_page = self::PER_PAGE)
         ));
     }
 
+    /**
+     * @param string $username
+     * @return mixed
+     */
+    public function lookup($username)
+    {
+        return $this->get('users', array(
+            'username' => $username
+        ));
+    }
+
     /**
      * @param string $query
      * @param null|true $active