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.
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That is kind of a trick question. The most Championship belts held at one time (both Major and Minor) in one division would be Roy Jones Jr with 9 at Light Heavyweight. He held the WBA Super,WBA,WBC,IBF,IBO,IBA,WBF,NBA and Ring Magazine belts at the same time.