Thomas Bernard Colcolough (October 8, 1870 – December 10, 1919) was a professional baseball player. He was a right-handed pitcher over parts of four seasons (1893–1895, 1899) with the Pittsburgh Pirates and New York Giants. For his career, he compiled a 14–11 record in 47 appearances, with a 5.67 earned run average and 65 strikeouts.