Fabio Onidi
- H.F. O`Brien
- Robert O`Brien
- Charlie O`Brien
- Johnny O`Connell
- Pat O`Connor
- Eddie O`Donnell
- Kevin O`Hara
- John O`Hara
- Cletus `Cowboy` O`Rourke
- Don O`Sullivan
- Patricio O`Ward
- Darryl O`Young
- Daryl O`Young
- Danny Oakes
- Willi Obermann
- Peter Oberndorfer
- Stefan Oberndorfer
- Toshiyuki Ochiai
- Esteban Ocon
- Fritz Oesterle
- Markus Oestreich
- Christer Offason
- Eric Offenstadt
- Ashtam Oganezov
- Sebastien Ogier
- Hakan Olausson
- Barney Oldfield
- Jackie Oliver
- Yves Olivier
- Anders Olofsson
- Omaccha
- Jorg van Ommen
- Danny Ongais
- Fabio Onidi
- Rikky von Opel
- Pepe Oriola
- Vladimir Orlov
- M. Orr
- Stephane Ortelli
- Egor Orudzhev
- Kazuya Oshima
- Jimmy Oskie
- Johannes van Overbeek
- David Oxton
Race results
| Date | Circuit | Category | Entrant | Car | # | Grid | Pos | Status |
|---|
Championships results
| Year | Championship | Place | Pts |
|---|---|---|---|
| 2012 | GP2 Series | 20 | 14 |