WBO Welterweight champion
Ring Magazine / IBO Jr Welter champion
WBC Lightweight champion
WBC / Ring Magazine Jr lightweight champion
Ring Magazine Featherweight champion
IBF Jr Featherweight Champion
WBC Flyweight Champion
Actually Oscar Delahoya is the only true 6 weight class champion. He won MAJOR titles in all 6.
If it is most boxing championships (major and minor, regardless of division) that would be Roy Jones Jr.
IBF - Middleweight Champion
IBF- Super Middleweight Champion
WBC- Lightheavyweight Champion (3 times)
WBA Light Heavyweight Champion
WBA Super Light Heavyweight Champion
WBA - Heavyweight Champion
IBF Light Heavyweight Champion
IBO Light Heavyweight Champion
Ring Magazine - Light Heavyweight Champion
IBA - Light Heavyweight Champion
WBF - Light Heavyweight Champion
NBA - Light Heavyweight Champion
IBC - Light Heavyweight Champion
NABO - Light Heavyweight Champion (2 times)
WBC Continental Americas - Super Middleweight Champion
UBO - Intercontinental Light Heavyweight Champion
European Amateur Boxing Championships was created in 1925.
World Amateur Boxing Championships was created in 1974.
African Amateur Boxing Championships was created in 1962.
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.
who has the most NBA championships
The person who has the most championships is YA MUM!!!
Alabama has the most championships post 1936, but Princeton claimed the most national championships prior to 1936
The motorcycle company with the most championships is Aprilia
which player won the most BCS championships