Hide sponsors with less than 10 entries
Ignore non-championship races
| No | Sponsor | Races | Active Years |
|---|
| 1617 | O.Z. Racing | 568 |
1985, 1991–1993, 1996–1998, 2000–2023 |
| 1618 | O2 | 55 |
2004–2006 |
| 1619 | Oakberry | 10 |
2025 |
| 1620 | Oakley | 159 |
2014–2016, 2021–2025 |
| 1621 | Obex Oil | 12 |
1977 |
| 1622 | Ocean Bottle | 85 |
2021–2025 |
| 1623 | Ocean's Twelve | 1 |
2004 |
| 1624 | OECE | 1 |
1981 |
| 1625 | Oerlikon | 85 |
2011–2015 |
| 1626 | Oerlikon Balzers | 11 |
2011 |
| 1627 | OGAP | 16 |
1991 |
| 1628 | OGIO | 91 |
2021–2025 |
| 1629 | Ogio | 8 |
2025 |
| 1630 | OGX | 27 |
2011–2012 |
| 1631 | Ohlins | 56 |
2023–2025 |
| 1632 | Okta | 10 |
2025 |
| 1633 | OKX | 74 |
2022–2025 |
| 1634 | Oliver Sweeney | 52 |
2005, 2007–2008 |
| 1635 | Olivetti | 95 |
1981–1982, 1984–1987 |
| 1636 | Olympus | 175 |
1978–1979, 1985, 2003–2005, 2008–2011 |
| 1637 | Olympus Cameras (Non-champ only) | 5 |
1977 |
| 1638 | OMB | 50 |
1998, 2000–2001 |
| 1639 | Omnitude | 38 |
2018–2019 |
| 1640 | OMP | 308 |
1997–1998, 2000–2001, 2008, 2010–2020, 2024 |
| 1641 | OMP Racing | 124 |
2010–2012, 2021–2023 |
| 1642 | OMR | 456 |
1992, 2000–2001, 2004–2025 |
| 1643 | On AG | 78 |
2013–2016 |
| 1644 | One All Sports | 16 |
2014 |
| 1645 | OnePlus | 21 |
2019 |
| 1646 | ONERA | 16 |
1999 |
| 1647 | Onsemi | 55 |
2023–2025 |
| 1648 | Openvision | 33 |
1997–1998 |
| 1649 | Optimal Payments | 34 |
2012–2013 |
| 1650 | Optimum Nutrition | 34 |
2024–2025 |
| 1651 | OptionRally | 17 |
2016 |
| 1652 | Oracle | 133 |
1994–1995, 2021–2025 |
| 1653 | Orange | 46 |
2000–2002 |
| 1654 | Orange Bus | 53 |
2017–2019 |
| 1655 | Orion180 | 10 |
2025 |
| 1656 | ORIS | 198 |
2002–2012 |
| 1657 | Oris | 119 |
2013–2018 |
| 1658 | Orlen | 67 |
2019, 2023–2024 |
| 1659 | OS Integration | 66 |
1996, 1998, 2000–2001 |
| 1660 | Osama | 96 |
1989–1991, 1993–1994, 1996 |
| 1661 | Ouilleres | 16 |
1999 |
| 1662 | Oura | 22 |
2021 |
| 1663 | Ovoro | 7 |
1976 |
| 1664 | Oxigen | 8 |
2010 |
| 1665 | Ozalid | 51 |
2002–2004 |
| 1666 | OZJet | 19 |
2005 |
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