Kristof Vliegen (born June 22, 1982 in Maaseik) is a Belgian tennis player. He plays right-handed and he turned professional in 2001.

He was a semi-finalist in Chennai in 2006 and in May of the same year, he reached the final of the ATP tournament in Munich, setting up the first ever all-Belgian men's singles final against Olivier Rochus. In July, Vliegen reached the second round of Wimbledon. He also is considered one of Belgian's best and most respected tennis players currently on the ATP.