Hernán Gumy (born March 5, 1972 in Buenos Aires) is a former tennis player from Argentina, who turned professional in 1991. He represented his native country at the 1996 Summer Olympics in Atlanta, Georgia, where he was defeated in the first round by Venezuela's Nicolas Pereira.

The righthander reached his highest singles ATP-ranking on August 19, 1996, when he became the number 39 of the world. Gumy won the gold medal in the men's singles competition at the 1995 Pan American Games.