Thomas Barr may refer to:
Thomas J. Barr (1812–1881), U.S. representative from New York Thomas D. Barr (1931–2008), lawyer at Cravath, Swaine & Moore Thomas Barr (athlete) (born 1992), Irish athlete Tommy Barr (born 1942), Scottish footballer
Moe Barr (Thomas L. Barr, born 1947), American basketball player