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.

Colcolough was born and later died in Charleston, South Carolina at the age of 49.

This biographical article relating to an American baseball pitcher born in the 1870s is a stub.