John Wesley Coombs (November 18, 1882 – April 15, 1957), nicknamed "Colby Jack" after his alma mater, was an American professional baseball player. He played in Major League Baseball as a pitcher for the Philadelphia Athletics (1906–14), Brooklyn Robins (1915–18), and Detroit Tigers (1920). In 1910, Coombs won 31 games during the regular season and three games in the World Series to lead the Athletics to the championship. A two-way player, he also occasionally played as an outfielder.