Undefeated world boxing champions

Floyd Joy Mayweather Jr. is an American professional boxer and boxing promoter. He is undefeated at 50–0. Mayweather won 15 major world championships spanning five weight classes from super featherweight to light middleweight. This includes the Ring magazine title in three weight classes. As an amateur, he won a bronze medal in the featherweight division at the 1996 Olympics, three U.S. Golden Gloves championships, and the U.S. national championship at featherweight. After retiring from professional boxing in August 2017, he transitioned to exhibition boxing.

American heavyweight boxing champion (1923-1969)

American television personality and retired professional boxer

Welsh boxer

British boxer

American boxer

Venezuelan boxer (1981-2010)

German boxer

Mexican boxer

Russian boxer

Russian boxer and kickboxer

Romanian boxer

American boxer (1870–1943)

Namibian boxer

American boxer (1866–1937)

Trinidad and Tobago boxer (1987–2009)

British boxer

South Korean boxer

Thai boxer