Hide sponsors with less than 10 entries
Include non-championship races
| No | Sponsor | Races | Active Years |
|---|
| 1421 | O.Z. Racing | 533 |
1985, 1991–1993, 1996–1998, 2000–2022 |
| 1422 | O2 | 55 |
2004–2006 |
| 1423 | Oakley | 90 |
2014–2016, 2021–2022 |
| 1424 | Obex Oil | 11 |
1977 |
| 1425 | Ocean Bottle | 16 |
2021–2022 |
| 1426 | Ocean's Twelve | 1 |
2004 |
| 1427 | OECE | 1 |
1981 |
| 1428 | Oerlikon | 85 |
2011–2015 |
| 1429 | Oerlikon Balzers | 11 |
2011 |
| 1430 | OGAP | 16 |
1991 |
| 1431 | OGIO | 30 |
2021–2022 |
| 1432 | OGX | 27 |
2011–2012 |
| 1433 | OKX | 5 |
2022 |
| 1434 | Oliver Sweeney | 52 |
2005, 2007–2008 |
| 1435 | Olivetti | 95 |
1981–1982, 1984–1987 |
| 1436 | Olympus | 173 |
1978–1979, 1985, 2003–2005, 2008–2011 |
| 1437 | OMB | 50 |
1998, 2000–2001 |
| 1438 | Omnitude | 38 |
2018–2019 |
| 1439 | OMP | 284 |
1997–1998, 2000–2001, 2008, 2010–2020 |
| 1440 | OMP Racing | 89 |
2010–2012, 2021–2022 |
| 1441 | OMR | 396 |
1992, 2000–2001, 2004–2022 |
| 1442 | On AG | 78 |
2013–2016 |
| 1443 | One All Sports | 16 |
2014 |
| 1444 | OnePlus | 21 |
2019 |
| 1445 | ONERA | 16 |
1999 |
| 1446 | Openvision | 33 |
1997–1998 |
| 1447 | Optimal Payments | 34 |
2012–2013 |
| 1448 | OptionRally | 17 |
2016 |
| 1449 | Oracle | 64 |
1994–1995, 2021–2022 |
| 1450 | Orange | 46 |
2000–2002 |
| 1451 | Orange Bus | 53 |
2017–2019 |
| 1452 | Oris | 119 |
2013–2018 |
| 1453 | ORIS | 198 |
2002–2012 |
| 1454 | Orlen | 21 |
2019 |
| 1455 | OS Integration | 66 |
1996, 1998, 2000–2001 |
| 1456 | Osama | 96 |
1989–1991, 1993–1994, 1996 |
| 1457 | Ouilleres | 16 |
1999 |
| 1458 | Oura | 22 |
2021 |
| 1459 | Ovoro | 7 |
1976 |
| 1460 | Oxigen | 8 |
2010 |
| 1461 | Ozalid | 51 |
2002–2004 |
| 1462 | OZJet | 19 |
2005 |
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