Mark Andrew Spitz (born February 10, 1950, in Modesto, California) is an American swimmer.

He holds the record for most gold medals won in a single Olympic Games (seven), which he set at the 1972 Summer Olympics in Munich, Germany.

Between 1965 and 1972, Spitz won 9 Olympic gold medals, 1 silver, and 1 bronze; 5 Pan American golds; 31 National U.S. Amateur Athletic Union titles; and 8 U.S. National Collegiate Athletic Association Championships. During those years, he set 33 world records.