Harry Elwood "Moose" McCormick (February 28, 1881 – July 9, 1962) was an American professional baseball outfielder. He played all or part of five seasons in Major League Baseball between 1904 and 1913 for the New York Giants, Pittsburgh Pirates, and Philadelphia Phillies. McCormick also served in the United States Army during World War I and as a civilian director of the United States Army Air Forces during World War II. Under manager John McGraw of the Giants, he was one of the first pinch hitters in the game's history and was considered one of the best pinch hitters in the game.