Welterweight
| Number | Champion | Reign |
|---|---|---|
| 1 | Jimmy McLarnin | 1933 - May 28, 1934 |
| 2 | Barney Ross | May 28, 1934 - September 17, 1934 |
| 3 | Jimmy McLarnin | September 17, 1934 - May 28, 1935 |
| 4 | Barney Ross | May 28, 1935 - May 31, 1938 |
| 5 | Henry Armstrong | May 31, 1938 - October 4, 1940 |
| 6 | Fritzie Zivic | October 4, 1940 - July 29, 1941 |
| 7 | Freddie Cochrane | July 29, 1941 - February 1, 1946 |
| 8 | Marty Servo | February 1, 1946 - September 25, 1946 (Retired) |
| 9 | Sugar Ray Robinson (beat Tommy Bell) | December 20, 1946 - 1951 |
| 10 | Kid Gavilan (beat Billy Graham) | August 29, 1951 - October 20, 1954 |
| 11 | Johnny Saxton | October 20, 1954 - April 1, 1955 |
| 12 | Tony DeMarco | April 1, 1955 - June 10, 1955 |
| 13 | Carmen Basilio | June 10, 1955 - March 14, 1956 |
| 14 | Johnny Saxton | March 14, 1956 - September 12, 1956 |
| 15 | Carmen Basilio | September 12, 1956 - September 23, 1957 (Vacated / Won Middleweight) |
| 16 | Virgil Akins (beat Vince Martinez) | June 6, 1958 - December 5, 1958 |
| 17 | Don Jordan | December 5, 1958 - May 27, 1960 |
| 18 | Benny Paret | May 27, 1960 - April 1, 1961 |
| 19 | Emile Griffith | April 1, 1961 - September 30, 1961 |
| 20 | Benny Paret | September 30, 1961 - March 24, 1962 |
| 21 | Emile Griffith | March 24, 1962 - March 21, 1963 |
| 22 | Luis Manuel Rodríguez | March 21, 1963 - June 8, 1963 |
| 23 | Emile Griffith | June 8, 1963 - April 25, 1966 (Vacated / Won Middleweight) |
| 24 | Curtis Cokes (beat Jean Josselin) | November 28, 1966 - April 18, 1969 |
| 25 | José Nápoles | April 18, 1969 - December 3, 1970 |
| 26 | Billy Backus | December 3, 1970 - June 4, 1971 |
| 27 | José Nápoles | June 4, 1971 - December 6, 1975 |
| 28 | John Stracey | December 6, 1975 - June 22, 1976 |
| 29 | Carlos Palomino | June 22, 1976 - January 14, 1979 |
| 30 | Wilfred Benítez | January 14, 1979 - November 30, 1979 |
| 31 | Sugar Ray Leonard | November 30, 1979 - June 20, 1980 |
| 32 | Roberto Durán | June 20, 1980 - November 25, 1980 |
| 33 | Sugar Ray Leonard | November 25, 1980 - November 9, 1982 (Retired) |
| 34 | Donald Curry (defeated Milton McCrory) | December 6, 1985 - September 27, 1986 |
| 35 | Lloyd Honeyghan | September 27, 1986 - October 27, 1987 |
| 36 | Jorge Vaca | October 27, 1987 - March 29, 1988 |
| 37 | Lloyd Honeyghan | March 29, 1988 - February 4, 1989 |
| 38 | Marlon Starling | February 4, 1989 - March 2, 1989 (The Ring ceased publication for 7 months) |
| 39 | Vernon Forrest (beat Shane Mosley) | January 26, 2002 - January 25, 2003 |
| 40 | Ricardo Mayorga | January 25, 2003 - December 13, 2003 |
| 41 | Cory Spinks | December 13, 2003 - February 5, 2005 |
| 42 | Zab Judah | February 5, 2005 - January 7, 2006 |
| 43 | Carlos Manuel Baldomir | January 7, 2006 - November 4, 2006 |
| 44 | Floyd Mayweather Jr. | November 4, 2006 - June 29, 2008 (Retired) |
Read more about this topic: List Of The Ring World Champions