Heavyweight
| Number | Champion | Reign |
|---|---|---|
| 1 | Jack Dempsey | 1922 - September 23, 1926 |
| 2 | Gene Tunney | September 23, 1926 - July 31, 1928 (Retired) |
| 3 | Max Schmeling (defeated Jack Sharkey) | June 12, 1930 - June 21, 1932 |
| 4 | Jack Sharkey | June 21, 1932 - June 29, 1933 |
| 5 | Primo Carnera | June 29, 1933 - June 14, 1934 |
| 6 | Max Baer | June 14, 1934 - June 13, 1935 |
| 7 | James J. Braddock | June 13, 1935 - June 22, 1937 |
| 8 | Joe Louis | June 22, 1937 - September 27, 1950 |
| 9 | Ezzard Charles | September 27, 1950 - July 18, 1951 |
| 10 | Jersey Joe Walcott | July 18, 1951 - September 23, 1952 |
| 11 | Rocky Marciano | September 23, 1952 - April 27, 1956 (Retired) |
| 12 | Floyd Patterson (defeated Archie Moore) | November 30, 1956 - June 26, 1959 |
| 13 | Ingemar Johansson | June 26, 1959 - June 20, 1960 |
| 14 | Floyd Patterson | June 20, 1960 - September 25, 1962 |
| 15 | Sonny Liston | September 25, 1962 - February 25, 1964 |
| 16 | Muhammad Ali | February 25, 1964 - March 8, 1971 |
| 17 | Joe Frazier | March 8, 1971 - January 22, 1973 |
| 18 | George Foreman | January 22, 1973 - October 30, 1974 |
| 19 | Muhammad Ali | October 30, 1974 - February 15, 1978 |
| 20 | Leon Spinks | February 15, 1978 - September 15, 1978 |
| 21 | Muhammad Ali | September 15, 1978 - October 2, 1980 |
| 22 | Larry Holmes | October 2, 1980 - September 21, 1985 |
| 23 | Michael Spinks | September 21, 1985 - June 27, 1988 |
| 24 | Mike Tyson | June 27, 1988 - February 11, 1990 |
| 25 | James Douglas | February 11, 1990 - October 25, 1990 |
| 26 | Evander Holyfield | October 25, 1990 - Oct. 1990 (discontinued championship policy during Holyfield's reign) |
| 27 | Lennox Lewis | 2002 - February 6, 2004 (Retired) |
| 28 | Vitali Klitschko (defeated Corrie Sanders) | April 24, 2004 - November 9, 2005 (Retired) |
| 29 | Wladimir Klitschko (defeated Ruslan Chagaev) | June 20, 2009–present |
Read more about this topic: List Of The Ring World Champions