Hide sponsors with less than 10 entries
Ignore non-championship races
| No | Sponsor | Races | Active Years |
|---|
| 1694 | O.Z. Racing | 568 |
1985, 1991–1993, 1996–1998, 2000–2023 |
| 1695 | O2 | 55 |
2004–2006 |
| 1696 | Oakberry | 39 |
2025–2026 |
| 1697 | Oakley | 188 |
2014–2016, 2021–2026 |
| 1698 | Obex Oil | 12 |
1977 |
| 1699 | Ocean Bottle | 99 |
2021–2025 |
| 1700 | Ocean's Twelve | 1 |
2004 |
| 1701 | Octave | 15 |
2026 |
| 1702 | OECE | 1 |
1981 |
| 1703 | Oerlikon | 85 |
2011–2015 |
| 1704 | Oerlikon Balzers | 11 |
2011 |
| 1705 | OGAP | 16 |
1991 |
| 1706 | OGIO | 91 |
2021–2025 |
| 1707 | Ogio | 22 |
2025 |
| 1708 | OGX | 27 |
2011–2012 |
| 1709 | Ohlins | 70 |
2023–2025 |
| 1710 | Okta | 39 |
2025–2026 |
| 1711 | OKX | 103 |
2022–2026 |
| 1712 | Oliver Sweeney | 52 |
2005, 2007–2008 |
| 1713 | Olivetti | 95 |
1981–1982, 1984–1987 |
| 1714 | Olympus | 175 |
1978–1979, 1985, 2003–2005, 2008–2011 |
| 1715 | Olympus Cameras (Non-champ only) | 5 |
1977 |
| 1716 | OMB | 50 |
1998, 2000–2001 |
| 1717 | Omnitude | 38 |
2018–2019 |
| 1718 | OMP | 308 |
1997–1998, 2000–2001, 2008, 2010–2020, 2024 |
| 1719 | OMP Racing | 124 |
2010–2012, 2021–2023 |
| 1720 | OMR | 485 |
1992, 2000–2001, 2004–2026 |
| 1721 | On AG | 78 |
2013–2016 |
| 1722 | One All Sports | 16 |
2014 |
| 1723 | ONEflight | 8 |
2026 |
| 1724 | OnePlus | 21 |
2019 |
| 1725 | ONERA | 16 |
1999 |
| 1726 | Onsemi | 69 |
2023–2025 |
| 1727 | Openvision | 33 |
1997–1998 |
| 1728 | Optimal Payments | 34 |
2012–2013 |
| 1729 | Optimum Nutrition | 63 |
2024–2026 |
| 1730 | OptionRally | 17 |
2016 |
| 1731 | Oracle | 162 |
1994–1995, 2021–2026 |
| 1732 | Orange | 46 |
2000–2002 |
| 1733 | Orange Bus | 53 |
2017–2019 |
| 1734 | Orion180 | 39 |
2025–2026 |
| 1735 | ORIS | 198 |
2002–2012 |
| 1736 | Oris | 119 |
2013–2018 |
| 1737 | Orlen | 67 |
2019, 2023–2024 |
| 1738 | OS Integration | 66 |
1996, 1998, 2000–2001 |
| 1739 | Osama | 96 |
1989–1991, 1993–1994, 1996 |
| 1740 | Ouilleres | 16 |
1999 |
| 1741 | Oura | 22 |
2021 |
| 1742 | Ovoro | 7 |
1976 |
| 1743 | Oxigen | 8 |
2010 |
| 1744 | Ozalid | 51 |
2002–2004 |
| 1745 | OZJet | 19 |
2005 |
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