Hide sponsors with less than 10 entries
Include non-championship races
| No | Sponsor | Races | Active Years |
|---|
| 1551 | O.Z. Racing | 568 |
1985, 1991–1993, 1996–1998, 2000–2023 |
| 1552 | O2 | 55 |
2004–2006 |
| 1553 | Oakley | 130 |
2014–2016, 2021–2024 |
| 1554 | Obex Oil | 11 |
1977 |
| 1555 | Ocean Bottle | 56 |
2021–2024 |
| 1556 | Ocean's Twelve | 1 |
2004 |
| 1557 | OECE | 1 |
1981 |
| 1558 | Oerlikon | 85 |
2011–2015 |
| 1559 | Oerlikon Balzers | 11 |
2011 |
| 1560 | OGAP | 16 |
1991 |
| 1561 | OGIO | 70 |
2021–2024 |
| 1562 | OGX | 27 |
2011–2012 |
| 1563 | Ohlins | 27 |
2023–2024 |
| 1564 | OKX | 45 |
2022–2024 |
| 1565 | Oliver Sweeney | 52 |
2005, 2007–2008 |
| 1566 | Olivetti | 95 |
1981–1982, 1984–1987 |
| 1567 | Olympus | 173 |
1978–1979, 1985, 2003–2005, 2008–2011 |
| 1568 | OMB | 50 |
1998, 2000–2001 |
| 1569 | Omnitude | 38 |
2018–2019 |
| 1570 | OMP | 289 |
1997–1998, 2000–2001, 2008, 2010–2020, 2024 |
| 1571 | OMP Racing | 124 |
2010–2012, 2021–2023 |
| 1572 | OMR | 427 |
1992, 2000–2001, 2004–2024 |
| 1573 | On AG | 78 |
2013–2016 |
| 1574 | One All Sports | 16 |
2014 |
| 1575 | OnePlus | 21 |
2019 |
| 1576 | ONERA | 16 |
1999 |
| 1577 | Onsemi | 26 |
2023–2024 |
| 1578 | Openvision | 33 |
1997–1998 |
| 1579 | Optimal Payments | 34 |
2012–2013 |
| 1580 | Optimum Nutrition | 5 |
2024 |
| 1581 | OptionRally | 17 |
2016 |
| 1582 | Oracle | 104 |
1994–1995, 2021–2024 |
| 1583 | Orange | 46 |
2000–2002 |
| 1584 | Orange Bus | 53 |
2017–2019 |
| 1585 | Oris | 119 |
2013–2018 |
| 1586 | ORIS | 198 |
2002–2012 |
| 1587 | Orlen | 48 |
2019, 2023–2024 |
| 1588 | OS Integration | 66 |
1996, 1998, 2000–2001 |
| 1589 | Osama | 96 |
1989–1991, 1993–1994, 1996 |
| 1590 | Ouilleres | 16 |
1999 |
| 1591 | Oura | 22 |
2021 |
| 1592 | Ovoro | 7 |
1976 |
| 1593 | Oxigen | 8 |
2010 |
| 1594 | Ozalid | 51 |
2002–2004 |
| 1595 | OZJet | 19 |
2005 |
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