Tom Hyer (January 1, 1819 – June 26, 1864) was an American bare-knuckle boxer.
He became a world heavyweight boxing champion after defeating Country McCloskey in a long brutal fight in New York on September 9, 1841, though there was no global sanctioning body to recognize his championship.
He held the title until vacating it in 1851, and was widely celebrated as the first American to hold the honor.
His victory increased American participation in boxing, and made him a celebrity, generating fight coverage and publicity in hundreds of American newspapers.
He could be a brawler and engaged in several bar fights.
The fights he had as a result of his political association with the nativist Bowery Boys' anti-Immigration gang in 1855, could be particularly violent, and often involved weapons.