Hide sponsors with less than 10 entries
Ignore non-championship races
| No | Sponsor | Races | Active Years |
|---|
| 1631 | O.Z. Racing | 568 |
1985, 1991–1993, 1996–1998, 2000–2023 |
| 1632 | O2 | 55 |
2004–2006 |
| 1633 | Oakberry | 24 |
2025 |
| 1634 | Oakley | 173 |
2014–2016, 2021–2025 |
| 1635 | Obex Oil | 12 |
1977 |
| 1636 | Ocean Bottle | 99 |
2021–2025 |
| 1637 | Ocean's Twelve | 1 |
2004 |
| 1638 | OECE | 1 |
1981 |
| 1639 | Oerlikon | 85 |
2011–2015 |
| 1640 | Oerlikon Balzers | 11 |
2011 |
| 1641 | OGAP | 16 |
1991 |
| 1642 | OGIO | 91 |
2021–2025 |
| 1643 | Ogio | 22 |
2025 |
| 1644 | OGX | 27 |
2011–2012 |
| 1645 | Ohlins | 70 |
2023–2025 |
| 1646 | Okta | 24 |
2025 |
| 1647 | OKX | 88 |
2022–2025 |
| 1648 | Oliver Sweeney | 52 |
2005, 2007–2008 |
| 1649 | Olivetti | 95 |
1981–1982, 1984–1987 |
| 1650 | Olympus | 175 |
1978–1979, 1985, 2003–2005, 2008–2011 |
| 1651 | Olympus Cameras (Non-champ only) | 5 |
1977 |
| 1652 | OMB | 50 |
1998, 2000–2001 |
| 1653 | Omnitude | 38 |
2018–2019 |
| 1654 | OMP | 308 |
1997–1998, 2000–2001, 2008, 2010–2020, 2024 |
| 1655 | OMP Racing | 124 |
2010–2012, 2021–2023 |
| 1656 | OMR | 470 |
1992, 2000–2001, 2004–2025 |
| 1657 | On AG | 78 |
2013–2016 |
| 1658 | One All Sports | 16 |
2014 |
| 1659 | OnePlus | 21 |
2019 |
| 1660 | ONERA | 16 |
1999 |
| 1661 | Onsemi | 69 |
2023–2025 |
| 1662 | Openvision | 33 |
1997–1998 |
| 1663 | Optimal Payments | 34 |
2012–2013 |
| 1664 | Optimum Nutrition | 48 |
2024–2025 |
| 1665 | OptionRally | 17 |
2016 |
| 1666 | Oracle | 147 |
1994–1995, 2021–2025 |
| 1667 | Orange | 46 |
2000–2002 |
| 1668 | Orange Bus | 53 |
2017–2019 |
| 1669 | Orion180 | 24 |
2025 |
| 1670 | Oris | 119 |
2013–2018 |
| 1671 | ORIS | 198 |
2002–2012 |
| 1672 | Orlen | 67 |
2019, 2023–2024 |
| 1673 | OS Integration | 66 |
1996, 1998, 2000–2001 |
| 1674 | Osama | 96 |
1989–1991, 1993–1994, 1996 |
| 1675 | Ouilleres | 16 |
1999 |
| 1676 | Oura | 22 |
2021 |
| 1677 | Ovoro | 7 |
1976 |
| 1678 | Oxigen | 8 |
2010 |
| 1679 | Ozalid | 51 |
2002–2004 |
| 1680 | OZJet | 19 |
2005 |
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