Marty Riessen (born December 4, 1941) is an American former amateur and professional tennis player active from the 1960s to the 1980s.

[2] Renowned for his doubles play, Riessen was also a regular doubles partner of Australian tennis great Margaret Court, winning six of his seven major mixed titles and a career Grand Slam alongside her.

Riessen played collegiate tennis at Northwestern University, where he reached the National Collegiate Athletic Association (NCAA) singles finals three times: 1962 (falling to Rafael Osuna of University of Southern California); 1963 and 1964 (falling to Dennis Ralston of USC both times).

He won six singles titles in the open era, with the biggest coming in Cincinnati in 1974.

He also won 53 doubles titles, including the US Open (in 1976), the French Open (1971, with Arthur Ashe), and seven ATP Masters Series events: Paris Indoor (1976), Canada (1971 & 1970), Monte Carlo (1970), Hamburg (1968 and 1969), and Rome (1968).