Patrick Jonker (born 25 May 1969) is a retired Australian road bicycle racer from Dutch and German ancestry. He was a professional rider from 1993 to 2004. Jonker represented Australia twice at the Summer Olympics, in 1992 and 1996. He was an Australian Institute of Sport scholarship holder. The highlights of his career include wins in the 1997 Route du Sud, the 1999 Grand Prix de Wallonie and ending his career with a high profile victory in the 2004 Tour Down Under. In 2012, he denied any involvement in doping practices at U.S. Postal Service during his stint in the team in the 2000 season following the Lance Armstrong doping affair. He stated that the seven titles in the Tour de France that Armstrong won should be voided since the doping tests were unreliable at that time in his opinion.