Harold Henry Schumacher (November 23, 1910 – April 21, 1993), nicknamed "Prince Hal", was an American professional baseball player and right-handed pitcher who appeared in 391 games pitched (and 450 games in all) in Major League Baseball for the New York Giants in two different stints from 1931 to 1942 before coming back for one more season in 1946.

The following year (during which he received his degree from St. Lawrence), Schumacher helped pitch the Giants to the 1933 National League pennant and World Series championship.

His 19 victories, 2582⁄3 innings pitched, 21 complete games, seven shutouts and 2.16 earned run average were second on the staff only to Carl Hubbell, the future Baseball Hall of Fame left-hander.

His 5–4 victory kept the Giants' hopes alive, but they were eliminated in Game 6 by the Yankees, who were en route to four straight world championships.

He continued to take a turn in the Giants' starting rotation from 1938 to 1942, then entered the United States Navy, serving in the Pacific Theatre of Operations, and missed three full seasons during World War II.

He did not appear in that contest, but returned to the NL All-Star team in 1935 and hurled four innings of one-run ball in the American League's 4–1 victory at Cleveland Stadium.