| No. |
País Name |
Duration of reign |
D. |
| 1 |
Jack Dempsey |
July 2,
1921 -
September 23,
1926 |
2 |
| 2 |
Gene Tunney |
September 23,
1926 - July 31,
1931 |
2 |
| 3 |
Jack Sharkey |
September 26,
1929 - June 12,
1930 |
0 |
| 4 |
Max Schmeling |
June
12, 1930 - June 21,
1932 |
1 |
| 5 |
Jack Sharkey (2) |
June
21, 1932 - June 29,
1933 |
0 |
| 6 |
Primo Carnera |
not recognized by the NBA as champion |
|
| 7 |
Max
Baer |
June
14, 1934 - June 13,
1935 |
0 |
| 8 |
James J. Braddock |
June
13, 1935 - June 22,
1937 |
0 |
| 9 |
Joe
Louis |
June
22, 1937 - March 1,
1949 |
25 |
| 10 |
Ezzard Charles |
June
22, 1949 - July 18,
1951 |
8 |
| 11 |
Joe Walcott |
July
18, 1951 -
September 23,
1952 |
1 |
| 12 |
Rocky Marciano |
September 23,
1952 - April
27, 1956 |
6 |
| 13 |
Floyd Patterson |
November 30,
1956 - June 26,
1959 |
4 |
| 14 |
Ingemar Johansson |
June
26, 1959 - June 20,
1960 |
0 |
| 15 |
Floyd Patterson (2) |
June
20, 1960 -
September 25,
1962 |
2 |
| 16 |
Sonny Liston |
September 25,
1962 -
February 25,
1964 |
1 |
| 17 |
Cassius Clay (Ali) |
February 25,
1964 - June 19,
1964 |
0 |
| 18 |
Ernie Terrell |
March
5, 1965 -
February 6,
1967 |
2 |
| 19 |
Muhammad Ali (2) |
February 6,
1967 - April
27, 1968 |
0 |
| 20 |
Jimmy Ellis |
April 27,
1968 -
February 16,
1970 |
1 |
| 21 |
Joe Frazier |
February 16,
1970 -
January 22,
1973 |
4 |
| 22 |
George Foreman |
January 22,
1973 -
October 30,
1974 |
2 |
| 23 |
Muhammad Ali (3) |
October 30,
1974 -
February 15,
1978 |
10 |
| 24 |
Leon Spinks |
February 15,
1978 -
September 15,
1978 |
0 |
| 25 |
Muhammad Ali (4) |
September 15,
1978 -
October 20,
1979 |
0 |
| 26 |
John Tate |
October 20,
1979 - March
31, 1980 |
0 |
| 27 |
Mike Weaver |
March 31,
1980 -
December 10,
1982 |
2 |
| 28 |
Michael Dokes |
December 10,
1982 -
September 23,
1983 |
1 |
| 29 |
Gerrie Coetzee |
September 23,
1983 -
December 1,
1984 |
0 |
| 30 |
Greg Page |
December 1,
1984 - April
29, 1985 |
0 |
| 31 |
Tony Tubbs |
April 29,
1985 -
January 17,
1986 |
0 |
| 32 |
Tim Witherspoon |
January 17,
1986 -
December 12,
1986 |
1 |
| 33 |
James Smith |
December 12,
1986 - March 7,
1987 |
0 |
| 34 |
Mike Tyson |
March
7, 1987 -
February 11,
1990 |
8 |
| 35 |
James Douglas |
February 11,
1990 -
October 25,
1990 |
0 |
| 36 |
Evander Holyfield |
October 25,
1990 -
November 13,
1992 |
3 |
| 37 |
Riddick Bowe |
November 13,
1992 -
November 6,
1993 |
2 |
| 38 |
Evander Holyfield (2) |
November 6,
1993 - April
22, 1994 |
0 |
| 39 |
Michael Moorer |
April 22,
1994 -
November 5,
1994 |
0 |
| 40 |
George Foreman (2) |
November 5,
1994 - 1995 |
0 |
| 41 |
Bruce Seldon |
April
8, 1995 -
September 7,
1996 |
1 |
| 42 |
Mike Tyson (2) |
September 7,
1996 -
November 9,
1996 |
0 |
| 43 |
Evander Holyfield (3) |
November 9,
1996 -
November 13,
1999 |
4 |
| 44 |
Lennox Lewis |
November 13,
1999 - April
29, 2000 |
0 |
| 45 |
Evander Holyfield (4) |
August 12,
2000 - March 3,
2001 |
0 |
| 46 |
John
Ruiz |
March
3, 2001 - March 1,
2003 |
2 |
| 47 |
Roy Jones Jr. |
March
1, 2003 -
February 24,
2004 |
0 |
| 48 |
John Ruiz –
Interim |
December 13,
2003 -
February 24,
2004 |
0 |
| 49 |
John Ruiz (2) |
February 24,
2004 -
December 17,
2005 |
3 |
| 50 |
Nikolai Valuev |
December 17,
2005 - April
14, 2007 |
3 |
| 51 |
Ruslan Chagaev |
April 14,
2007 - Present |
0 |
