Bartholomew L. Cantz (January 29, 1860 – February 12, 1943) was an American catcher in Major League Baseball.

Born in Philadelphia, Pennsylvania, Cantz started his professional baseball career in 1884, playing for the Chambersburg Maroons and Littlestown Brown Stockings of the Keystone Association.

He played for the Long Island A's and Bridgeport Giants of the Eastern League in 1886.

In 1887, he moved to the Newark Little Giants of the International Association.

The following year he played with the Philadelphia Athletics, where he appeared in only five games before retiring.