Oscar “Golden Boy” De La Hoya, 39-6 with 30 stoppages, 1992 Olympic Gold Medalist, of East Los Angeles, California, won world titles in six weight classes.
They include Super Featherweight, Lightweight, Light Welterweight, Welterweight, Light Middleweight and Middleweight.
Manny “Pac Man” Pacquiao, 62-8-2 with 39 stoppages, of General Santos City, Philippines, won world titles in six different weight classes. They include Flyweight, Super Bantamweight, Super Featherweight, Lightweight, Welterweight, and Light Middleweight.
Floyd “Money” Mayweather, Jr., 50-0 with 27 stoppages, 1996 Olympic Bronze Medalist, of Las Vegas, Nevada, won world titles in five different weight classes. They include Super Featherweight, Lightweight, Light Welterweight, Welterweight and Light Middleweight.
“Sugar” Ray Leonard, 36-3-1 with 27 stoppages, 1976 Olympic Gold Medalist, of Palmer Park, Maryland, won world titles in five different weight classes. They include Welterweight, Light Middleweight, Middleweight, Super Middleweight and Light Heavyweight.
Roy Jones, Jr., 66-10 with 47 stoppages, 1988 Olympic Silver Medalist, of Pensacola, Florida, won world titles in four different weight classes.
Roberto “Hands of Stone” Duran, 103-16 with 70 stoppages, of Panama City, Panama, won world titles in four different weight classes. They include Lightweight, Welterweight, Light Middleweight, and Middleweight.
These titles include organizations including WBA, WBC, WBO, IBF, and IBO titles.
When there was only a world title there were two that stood out holding three world title in three different weight classes.
First was “Ruby” Bob Fitzsimmons, 61-8-4, with 57 stoppages of Timaru, New Zealand. He won titles at Middleweight in January of 1891 stopping Jack “Nonpareil” Dempsey, 50-1-2, in 13 rounds in New Orleans, Louisiana. He won the Heavyweight title, knocking out James J. Corbett, 10-0-3, in March of 1897 at Carson City, Nevada, and won the Light Heavyweight title, defeating George Gardner, 38-4-3, over 20 rounds, in San Francisco, California.
Second was Henry “Homicide Hank” Armstrong, 149-21-10, with 99 stoppages, of Los Angeles, California. He won the Featherweight title in October of 1937 stopping Petey Sarron, 107-22-13, in six rounds at Madison Square Garden, New York.
He won the Welterweight title in May of 1938 defeating Barney Ross, 74-3-3, at the Madison Square Garden Bowl, New York. In August of 1938 he won the Lightweight title defeating Lou Ambers, 75-5-7, at Madison Square Garden, New York being the only boxer to hold all three at the same time.
In August of 1943 Armstrong, 132-17-8, lost to the greatest pound for pound boxer “Sugar” Ray Robinson, 44-1, over ten rounds at Madison Square Garden, New York.