Harry Sylvester "Hal" Marnie (July 6, 1918 – January 7, 2002) was an American professional baseball player. Born in Philadelphia, he was a second baseman and shortstop who appeared in 96 games in Major League Baseball over parts of three seasons (1940–1942) for the Philadelphia Phillies. He threw and batted right-handed and was listed as 6 feet 1 inch (1.85 m) tall and 178 pounds (81 kg).