| Coureur | Nat | Geb. / Overl. | Cm / Kg | Zeges | Dit jaar |
|---|---|---|---|---|---|
| David O'Brien | AUS | ??cm / ??kg | 0 | 0 | |
| George O'Brien | GBR | 1935-01-03 | ??cm / ??kg | 0 | 0 |
| Henri 'Cocky' O'Brien | USA | ??cm / ??kg | 0 | 0 | |
| John O'Brien | AUS | ??cm / ??kg | 0 | 0 | |
| Liam O'Brien | IRL | 2005-03-16 | ??cm / ??kg | 0 | 0 |
| Mark O'Brien | AUS | 1987-09-16 | ??cm / ??kg | 0 | 0 |
| Paidi O'Brien | IRL | 1984-02-13 | ??cm / ??kg | 0 | 0 |
| David O'Conner | AUS | ??cm / ??kg | 0 | 0 | |
| Ronan O'Connor | IRL | 2003-09-10 | ??cm / ??kg | 0 | 0 |
| Bernard O'Dea | AUS | 1967-08-10 | ??cm / ??kg | 0 | 0 |
| Tom O'Donnel | AUS | ??cm / ??kg | 0 | 0 | |
| Bailey O'Donnell | NZL | 2000-09-25 | ??cm / ??kg | 0 | 0 |
| Patrick O'Donnell | USA | 1976-07-09 | ??cm / ??kg | 0 | 0 |
| David O'Dwyller | AUS | ??cm / ??kg | 0 | 0 | |
| Gavin O'Grady | USA | 1965-04-27 | ??cm / ??kg | 0 | 0 |
| A. O'Hagen | NZL | ??cm / ??kg | 0 | 0 | |
| Barry O'Hagen | AUS | ??cm / ??kg | 0 | 0 | |
| Brett O'Hara | AUS | ??cm / ??kg | 0 | 0 | |
| Dennis O'Keefe | AUS | ??cm / ??kg | 0 | 0 | |
| J. O'Keefe | AUS | ??cm / ??kg | 0 | 0 | |
| Barry O'Leary | GBR | ??cm / ??kg | 0 | 0 | |
| Connor O'Leary | USA | 1991-06-18 | ??cm / ??kg | 0 | 0 |
| Michael O'Loughlin | IRL | 1997-02-14 | ??cm / ??kg | 0 | 0 |
| Darragh O'Mahony | IRL | 1997-12-30 | ??cm / ??kg | 0 | 0 |
| Jim O'Parrel | AUS | ??cm / ??kg | 0 | 0 | |
| Cody O'Reilly | USA | 1988-01-24 | ??cm / ??kg | 0 | 0 |
| Tim O'Shannessy | AUS | ??cm / ??kg | 0 | 0 | |
| Glenn O'Shea | AUS | 1989-06-14 | ??cm / ??kg | 0 | 0 |
| P. O'Shea | NZL | ??cm / ??kg | 0 | 0 | |
| Peter O'Shea | AUS | ??cm / ??kg | 0 | 0 | |
| Finn O'Sullivan | IRL | 1968-08-26 | ??cm / ??kg | 0 | 0 |
| Gregory O'Sullivan | AUS | 1962-03-12 | ??cm / ??kg | 0 | 0 |
| Kane Oakley | AUS | 1976-10-04 | ??cm / ??kg | 0 | 0 |
| Ruben Oarbeascoa Ispizua | SPA | 1975-11-21 | ??cm / ??kg | 0 | 0 |
| Bryan Raul Obando Rosas | ECU | 2001-08-18 | ??cm / ??kg | 0 | 0 |
| Jairo Obando Torres | COL | 1968-02-26 | ??cm / ??kg | 0 | 0 |
| Yuta Obara | JPN | 1996-02-29 | ??cm / ??kg | 0 | 0 |
| Tomas Obdrzalek | CZE | 2003-03-27 | ??cm / ??kg | 0 | 0 |
| Bernhard Oberholzer | ZWI | 1985-09-08 | ??cm / ??kg | 0 | 0 |
| Luca Oberlechner | OOS | 2004-04-30 | ??cm / ??kg | 0 | 0 |
| Obermayer | DUI | ??cm / ??kg | 0 | 0 | |
| Gene Oberpriller | USA | 1962-02-28 | ??cm / ??kg | 0 | 0 |
| Emile Oberson | ZWI | ??cm / ??kg | 0 | 0 | |
| Gérald Oberson | ZWI | 1954-09-26 | ??cm / ??kg | 0 | 0 |
| Josef Oberstein | DUI | ??cm / ??kg | 0 | 0 | |
| Florian Obersteiner | DUI | 1995-10-11 | ??cm / ??kg | 0 | 0 |
| Luigi Oberti | ITA | ??cm / ??kg | 0 | 0 | |
| Theodor Obholzer | GBR | 1999-07-02 | ??cm / ??kg | 0 | 0 |
| Ernst Obliger | DUI | ??cm / ??kg | 0 | 0 | |
| Alberto Oblinger | OOS | 1910-09-10 | ??cm / ??kg | 0 | 0 |