David John Forbes (born 26 January 1934) is an Australian sailor who competed for his country at three Olympics from 1968 to 1976.
Forbes attended Newington College from 1943 to 1949.
He was the helmsman of the Australian boat in the star class at the 1968 Mexico City Olympics, where it finished eighth, and at the 1972 Munich Olympics, where he won a gold medal. At the 1976 Montreal Olympics, he helmed the Australian boat which finished eleventh in the soling class .
Forbes was also the mainsheet hand on the 1970 America's Cup challenger Gretel II.
Forbes was inducted into the Sport Australia Hall of Fame in 1988. In 2000, he received an Australian Sports Medal.