Boxers 39 / 53
Orzubek Nazarov (1966)
Oscar Andrade (1984)
Oscar Bonavena (1942)
Oscar De La Hoya (1973)
Óscar Larios (1976)
Oscar León (1974)
Oscar Meza (1986)
Óscar Rivas (1987)
Óscar Valdez (1990)
Ossie Ocasio (1955)
Osumana Akaba (1980)
Ovill McKenzie (1979)
Owen Beck (1976)
P. J. Gallagher (1973)
Pablo César Cano (1989)
Pablo Chacón (1975)
Packey McFarland (1888)
Paddy Barnes (1987)
Paddy DeMarco (1928)
Paddy Gallagher (1989)
Paddy Maguire (1948)
Paddy Ryan (1851)
Paipharob Kokietgym (1983)
Panama Al Brown (1902)
Paolo Roberto (1969)
Para Draine (1972)
Pascual Pérez (1926)
Pat O'Keefe (1883)
Pat Thomas (1950)
Patrice L'Heureux (1972)
Patricia Alcivar (1977)
Patrick Charpentier (1970)
Patrick Graham (1969)
Patrick Hyland (1983)
Patrick Killen (1861)
Patrick McGuigan (1868)
Patrizio Oliva (1959)
Paul Appleby (1987)
Paul Berlenbach (1901)