Klaus Graf (born 21 July 1969) is a German professional racing driver.

In 2005 he won the Trans-Am Series Driver's Championship, becoming the first Trans Am champion born outside the United States since David Hobbs in 1983.

In 2011, Graf collected further victories at Long Beach, Mosport, Mid-Ohio and Road America in the team's Lola-Aston Martin.

For 2012, Graf returned to the team and drove together with Lucas Luhr in a new HPD ARX-03a for the entire ALMS season.

Graf won the 2012 and 2013 ALMS LMP1 driver's championships with codriver Lucas Luhr.