Gustave Marinius Heiss (November 4, 1904 – June 7, 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.

[1] He also competed at the 1936 Summer Olympics in Berlin, where the American team placed fifth.

After briefly attending Tulane University, he entered the United States Military Academy at West Point.

After World War II, Heiss lived in Arlington, Virginia.

From 1947 to 1955 he worked as chief of vocational rehabilitation and education at the Veterans Administration.