Thomas H. Cahill (October 1868 – December 25, 1894) was an American professional baseball player who played from 1888 to 1894. He played one season in Major League Baseball and had a career batting average of .253 with 109 hits, 17 doubles, 7 triples, 3 home runs, 44 RBIs, and 38 stolen bases. He was of Irish descent.