| Coureur | Nat | Geb. / Overl. | Cm / Kg | Zeges | Dit jaar |
|---|---|---|---|---|---|
| Lars Otto Olsen | DEN | 1965-05-29 | ??cm / ??kg | 0 | 0 |
| Mike Olsen | DEN | 1985-12-18 | ??cm / ??kg | 0 | 0 |
| Nicki Hjort Olsen | DEN | 1982-03-13 | ??cm / ??kg | 0 | 0 |
| Otto Olsen | DEN | 1928-02-06 | ??cm / ??kg | 0 | 0 |
| Reno Bent Olsen | DEN | 1947-02-19 | ??cm / ??kg | 0 | 0 |
| Stefan Ravn Olsen | DEN | 1992-11-16 | ??cm / ??kg | 0 | 0 |
| Torbjörn Olsson | ZWE | 1962-03-02 | ??cm / ??kg | 0 | 0 |
| Daniel Olszewski | DUI | 1981-08-05 | ??cm / ??kg | 0 | 0 |
| Robert Oltarzewski | USA | 1962-02-05 | ??cm / ??kg | 0 | 0 |
| Eugène Oltz | FRA | ??cm / ??kg | 0 | 0 | |
| Kakeru Omae | JPN | 1997-08-03 | ??cm / ??kg | 0 | 0 |
| Carlo Omari | ITA | 1921-01-28 - 1979-05-05 | ??cm / ??kg | 0 | 0 |
| Cyriel Omeye | BEL | 1897-06-13 | ??cm / ??kg | 0 | 0 |
| Dias Omirzakov | KAZ | 1992-07-13 | ??cm / ??kg | 0 | 0 |
| Mats Omloop | BEL | 2002-10-14 | ??cm / ??kg | 0 | 0 |
| Wilfried Ommer | DUI | ??cm / ??kg | 0 | 0 | |
| Aljaz Omrzel | SLO | 2000-12-31 | ??cm / ??kg | 0 | 0 |
| Andrej Omulec | SLO | 1982-11-19 | ??cm / ??kg | 0 | 0 |
| Antonio Onaederra | SPA | ??cm / ??kg | 0 | 0 | |
| Juan Onaederra | SPA | ??cm / ??kg | 0 | 0 | |
| Ramon Onaederra | SPA | ??cm / ??kg | 0 | 0 | |
| Gaxento Onaederra Urkia | SPA | 1966-08-27 | ??cm / ??kg | 0 | 0 |
| Riku Onaka | JPN | 2003-07-05 | ??cm / ??kg | 0 | 0 |
| Kurt Onclin | BEL | 1966-12-16 | ??cm / ??kg | 0 | 0 |
| Ignacio Ondarroa | SPA | ??cm / ??kg | 0 | 0 | |
| François Ondet | FRA | 1902-12-02 | ??cm / ??kg | 0 | 0 |
| Louis Ondet | FRA | ??cm / ??kg | 0 | 0 | |
| Emanuele Onesti | ITA | 1995-06-21 | ??cm / ??kg | 0 | 0 |
| Piero Onesti | ITA | 1959-06-21 | ??cm / ??kg | 0 | 0 |
| Andrea Oneta | ITA | ??cm / ??kg | 0 | 0 | |
| Franco Ongarato | ITA | 1949-05-29 | ??cm / ??kg | 0 | 0 |
| Massimo Ongaro | ITA | 1914-08-14 - 2012-09-06 | ??cm / ??kg | 0 | 0 |
| Thomas Ongena | BEL | 1980-10-22 | ??cm / ??kg | 0 | 0 |
| Flory Ongenae | BEL | 1945-12-02 - 2025-09-19 | ??cm / ??kg | 0 | 0 |
| Ronan Onghena | BEL | 1957-01-10 - 2001-05-28 | ??cm / ??kg | 0 | 0 |
| Hannu Onnela | FIN | 1983-03-04 | ??cm / ??kg | 0 | 0 |
| Ken Ono | USA | 1966-03-20 | ??cm / ??kg | 0 | 0 |
| Naoshi Ono | JPN | ??cm / ??kg | 0 | 0 | |
| Rei Onodera | JPN | 1995-09-03 | ??cm / ??kg | 0 | 0 |
| Dick Oole | NED | 1921-07-24 | ??cm / ??kg | 0 | 0 |
| Jan Oomen | NED | ??cm / ??kg | 0 | 0 | |
| Henk Ooms | NED | 1916-03-18 | ??cm / ??kg | 0 | 0 |
| Léon Ooms | BEL | 1926-09-14 | ??cm / ??kg | 0 | 0 |
| Teunis Ooms | NED | 1919-01-20 | ??cm / ??kg | 0 | 0 |
| Willem Ooms | NED | 1897-01-13 | ??cm / ??kg | 0 | 0 |
| Gerard Oosterbosch | NED | 1951-01-11 | ??cm / ??kg | 0 | 0 |
| Joes Oosterlinck | BEL | 2003-05-22 | ??cm / ??kg | 0 | 0 |
| Jason Oosthuizen | ZAF | 1999-05-05 | ??cm / ??kg | 0 | 0 |
| Sander Oostlander | NED | 1984-11-25 | ??cm / ??kg | 0 | 0 |
| Folkert Oostra | NED | 1989-09-28 | ??cm / ??kg | 0 | 0 |