Gustave Marinius Heiss (4 November 1904 – 7 June 1982) was a United States fencing champion and winner of a bronze medal in team épée fencing at the 1932 Summer Olympics in Los Angeles. He also competed at the 1936 Summer Olympics in Berlin, where the American team placed fifth. He was a four-time U.S. National Épée Champion (1933, 1934, 1936, and 1941).