It's hard to say as there are so many sanctioning bodies nowadays. Different sanctioning body can has her own Champion. Actually, there are 17 divisions in professional boxing. It can be 17 Champions in each sanctioning body.
African Amateur Boxing Championships was created in 1962.
World Amateur Boxing Championships was created in 1974.
European Amateur Boxing Championships was created in 1925.
European Union Amateur Boxing Championships was created in 2003.
Ricky Hatton has won a total of fourteen boxing championships. These championships are spread between multiple weight classes.
George Wimpey Year Book 1983
Alabama has the most championships post 1936, but Princeton claimed the most national championships prior to 1936
The person who has the most championships is YA MUM!!!
The motorcycle company with the most championships is Aprilia
Princeton With 26 National Championships.
Princeton With 26 National Championships.
UCLA with 11 championships.