The Austrian Open Kitzbühel (formally known as the Generali Open Kitzbühel) is an annual tennis tournament held in Kitzbühel, Austria. The event was part of the ATP World Series from the creation of ATP World Tour till 1998, International Series Gold from 1999–2008 and ATP World Tour 250 series in 2009. It was a part of the ATP Challenger Tour in 2010 before regaining top tour status. It is once again part of the 250 series. The tournament has been held, since 1894, on clay courts.