| Name | Country | Years | Starts | Wins | Championships |
|---|---|---|---|---|---|
| R O'Brien | United States | 1952 | 1 | 0 | 0 |
| P O'Connor | United States | 1954-1958 | 5 | 0 | 0 |
| Z O'Sullivan | 0 | 0 | 0 | ||
| P O'Ward | Mexico | 0 | 0 | 0 | |
| E Ocon | France | 2016-2018,2020-2024 | 148 | 1 | 0 |
| J Oliver | Great Britain | 1968-1973,1977 | 48 | 0 | 0 |
| D Ongais | United States | 1977-1978 | 4 | 0 | 0 |
| K Oppitzhauser | Denmark | 0 | 0 | 0 | |
| A Owen | Great Britain | 1960 | 1 | 0 | 0 |
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