George Joseph Mullin (July 4, 1880 – January 7, 1944), sometimes known by the nickname "Wabash George", was an American right-handed baseball pitcher. Mullin played in Major League Baseball for 14 seasons with the Detroit Tigers from 1902 to 1913, Washington Senators in 1913, and the Indianapolis Hoosiers/Newark Pepper of the Federal League from 1914 to 1915. He compiled a career record of 228–196 with a 2.82 earned run average (ERA) and 1,482 strikeouts. His 1,244 career assists ranks sixth among major league pitchers. Mullin was also a strong hitter, twice batting over .300 for a season and compiling a career batting average of .262.