William Loes (December 13, 1929 – July 15, 2010) was an American right-handed pitcher who spent eleven seasons in Major League Baseball (MLB) with the Brooklyn Dodgers (1950, 1952–56), Baltimore Orioles (1956–59) and San Francisco Giants (1960–61). He appeared in three World Series with the Dodgers, including the only one won by the franchise when it was based in Brooklyn in 1955. In an 11-season career, Loes posted an 80–63 record with 645 strikeouts and a 3.89 ERA in 1190.1 innings pitched. He made the American League All-Star team in 1957.