O
| Driver |
Country |
Details |
|
|
|
|
| Robert O'Brien | USA | 1 start 1952 |
| Pat O'Connor | USA | 5 starts, 1 pole (Indy) 1954-1958 |
| Jackie Oliver | Great Britain | 50 starts, 13 points, 1 fastest lap 1967-1977 |
| Danny Ongais | USA | 4 starts 1977-1978 |
| Arthur Owen | Great Britain | 1 start 1960 |
|
|
|
|
