Oscar De La Hoya - 6 WBO Junior Lightweight title; World WBO, IBF Lightweight titles;
World WBC Junior Welterweight title;
World WBC Welterweight title (failed to win IBF title);
World WBC, WBA Junior Middleweight titles: WBO Middleweight title (failed to win World WBA, WBC, IBF titles).
Thomas Hearns - 5
World WBA Welterweight title;
World WBC Junior Middleweight title;
WBC, WBA Light Heavyweight titles:
WBC Middleweight title (failed to win World WBA, WBC, IBF titles):
WBO Super Middleweight title (failed to win the WBC title in controversial bout).
'Sugar' Ray Leonard - 5
World WBC, WBA Welterweight titles;
WBA Jr. Middleweight title (failed to win WBC title);
World WBC Middleweight title:
WBC Super Middleweight title (failed to win WBO title):
WBC Light Heavyweight title. (Won SMW and LHW titles in same bout).
Floyd Mayweather, Jr. - 5
WBC Junior Lightweight title;
World WBC Lightweight;
WBC Junior Welterweight title;
World WBC, IBF Welterweight titles:
World WBC Junior Middleweight title.
Oddiel Rodriguez
Oscar dela hoya with 6
Manny Pacquiao.
Henry Armstrong was the only boxer to hold titles in three different weight classes at the same time: featherweight, lightweight, and welterweight.
Bob fitzsimmons
1
Baby Jake matlala
Teófilo Stevenson
world titles in 7 divisions. including 3 ring magazine titles, and one other linear title (according to another publication)
I'm sure there are a few of them: Archie Moore for scoring the most ko's of any champion. Thomas Hearns for being the first boxer to win titles in 5 weight classes. Oscar De La Hoya for being the first to win 6. Manny Pacquiao for being the first to 7. Henry Armstrong for being the first to hold titles in 3 weight classes simultaneously.
Liverpool has the most titles
Erik Morales is a professional boxer from Mexico. He has won world titles in four different weight classes and is the first Mexican-born boxer to do so. He is most famous for his trilogies with Mexican boxing legend Marco Antonio Barrera and Filipino Manny Pacquiao.