Peter John Robertson (born 17 February 1976 in Melbourne) is an Olympic athlete from Australia, who competes in triathlon.

Robertson, who is also known as "Robbo", entered in his first triathlon at age 16 with his mates and became hooked on the sport.

He won the Australian Institute of Sport Athlete of the Year with Robin Bell in 2005.

Later in 2006 Robertson took sixth place in the ITU World Triathlon Championships, beating American Hunter Kemper by one second.

Tim Don, who won the race, deprived Robertson of a record equaling fourth World Championships win.