Finton Gerard David Cosby (May 15, 1909 in Roxbury, Massachusetts – November 26, 1996) was an American ice hockey player and businessman.

Cosby played goaltender for the Massachusetts Rangers, the team that won the 1933 World Ice Hockey Championships, representing the United States of America.

His outstanding performance (allowing one goal in five games) helped lead the United States to its first, and only, gold medal at the World Ice Hockey Championships.

He also represented his country at the 1938 World Ice Hockey Championships in Prague, Czechoslovakia, where the Americans finished in seventh place.

In 1938, he founded the successful sporting goods and athletic equipment company, Gerry Cosby & Co., along with his brother John, which had its headquarters at Madison Square Garden in New York.