In professional boxing, the undisputed champion of a weight class is the boxer who simultaneously holds world titles from all sanctioning organizations recognized major by each other and the International Boxing Hall of Fame). This means that the boxer must hold all four major championship belts (IBF, WBA, WBC, and WBO) in a division. Before the 1960s, most champions were "undisputed," although the term was rarely used). Early boxing champions at various weight divisions were established by acclamation between 1880 and 1920. Once a consensus champion had been awarded the title, the championship could usually be taken only by beating the reigning holder, establishing a lineal championship). If a fighter wins all the titles but is stripped by one organization of its title, he may continue to be considered the undisputed champion).

It is important to note that the term "undisputed" refers to the title that is undisputed, not the boxer. Boxers will always have challengers, and it doesnt mean they arent undisputed if they hold all the belts. There are currently three undisputed champions in mens boxing: Canelo Alvarez, Jermell Charlo, and Devin Haney.