Bartholomew L. "Bart" Cantz (January 29, 1860 – February 12, 1943) was an American catcher in Major League Baseball player, born in Philadelphia, Pennsylvania.
Cantz started his professional baseball career in 1884, playing in various minor leagues through 1887. In 1888, he played for the St. Louis Whites of the Western Association and then was transferred to the American Association's Baltimore Orioles. He appeared in 57 games for the Orioles in 1888-1889. The following year he played with the Philadelphia Athletics, where he appeared in only five games before retiring. In his three major league seasons, he batted at a .157 average with 34 hits and 18 runs batted in.