Combattants Etats-Unis
| 1951 |  | Omoyele Gonzalez | 0-1-0 REC | #6267 |  |
| 1952 |  | Orion Cosce | 1-2-0 UFC | #4063 | |
| 1953 |  | Orlando Sanders | 1-1-0 REC | #882 | |
| 1954 |  | Oscar Jurado Sanchez | 2-0-0 REC | #702 | |
| 1955 |  | Oseyiomon Oiyemhonlan | 1-2-0 REC | #5097 | |
| 1956 |  | Ovince St. Preux | 15-13-0 UFC | #308 | |
| 1957 |  | Ozzy Diaz | 1-3-0 UFC | #1133 | |
| 1958 |  | Pablo Garza | 3-3-0 UFC | #3255 | |
| 1959 |  | Paige VanZant | 5-4-0 UFC | #1821 | |
| 1960 |  | Pam Sorenson | 0-2-0 REC | #5751 | |
| 1961 |  | Paris Moran | 0-1-0 REC | #5013 | |
| 1962 |  | Parker Porter | 4-4-0 UFC | #2438 | |
| 1963 |  | Pat Audinwood | 0-2-0 UFC | #5837 | |
| 1964 |  | Pat Barry | 5-7-0 UFC | #2117 | |
| 1965 |  | Pat Downey | 1-1-0 REC | #4741 | |
| 1966 |  | Pat Healy | 0-5-0, 1NC UFC | #3016 | |
| 1967 |  | Pat Miletich | 8-2-0 UFC | #372 | |
| 1968 |  | Pat Sabatini | 9-2-0 UFC | #146 | |
| 1969 |  | Pat Schilling | 0-2-0 UFC | #4396 | |
| 1970 |  | Patchy Mix | 0-2-0 UFC | #1373 | |
| 1971 |  | Patrick Brady | 0-1-0 REC | #7866 | |
| 1972 |  | Patrick Cornett | 0-1-0 REC | #7117 | |
| 1973 |  | Patrick Cummins | 6-7-0 UFC | #1810 | |
| 1974 |  | Patrick Rivera | 0-1-0 REC | #4692 | |
| 1975 |  | Patrick Smith | 4-2-0 UFC | #2637 | |