The 2009 Allianz Suisse Open Gstaad was a tennis tournament played on outdoor red clay courts. It was the 42nd edition of the event known that year as the Allianz Suisse Open Gstaad and was part of the ATP World Tour 250 series of the 2009 ATP World Tour. It took place at the Roy Emerson Arena in Gstaad, Switzerland, from July 26 through August 2, 2009.