Hide sponsors with less than 10 entries
Ignore non-championship races
| No | Sponsor | Races | Active Years |
|---|
| 1332 | O.Z. Racing | 486 |
1985, 1991 - 1993, 1996 - 1998, 2000 - 2020 |
| 1333 | O2 | 55 |
2004 - 2006 |
| 1334 | Oakley | 59 |
2014 - 2016 |
| 1335 | Obex Oil | 12 |
1977 |
| 1336 | Ocean's Twelve | 1 |
2004 |
| 1337 | OECE | 1 |
1981 |
| 1338 | Oerlikon | 85 |
2011 - 2015 |
| 1339 | Oerlikon Balzers | 11 |
2011 |
| 1340 | OGAP | 16 |
1991 |
| 1341 | OGX | 27 |
2011 - 2012 |
| 1342 | Oliver Sweeney | 52 |
2005, 2007 - 2008 |
| 1343 | Olivetti | 95 |
1981 - 1982, 1984 - 1987 |
| 1344 | Olympus | 175 |
1978 - 1979, 1985, 2003 - 2005, 2008 - 2011 |
| 1345 | OMB | 50 |
1998, 2000 - 2001 |
| 1346 | Omnitude | 38 |
2018 - 2019 |
| 1347 | OMP | 268 |
1997 - 1998, 2000 - 2001, 2008, 2010 - 2020 |
| 1348 | OMP Racing | 58 |
2010 - 2012 |
| 1349 | OMR | 350 |
1992, 2000 - 2001, 2004 - 2020 |
| 1350 | On AG | 78 |
2013 - 2016 |
| 1351 | One All Sports | 16 |
2014 |
| 1352 | OnePlus | 21 |
2019 |
| 1353 | ONERA | 16 |
1999 |
| 1354 | Openvision | 33 |
1997 - 1998 |
| 1355 | Optimal Payments | 34 |
2012 - 2013 |
| 1356 | OptionRally | 17 |
2016 |
| 1357 | Oracle | 33 |
1994 - 1995 |
| 1358 | Orange | 46 |
2000 - 2002 |
| 1359 | Orange Bus | 53 |
2017 - 2019 |
| 1360 | Oris | 119 |
2013 - 2018 |
| 1361 | ORIS | 198 |
2002 - 2012 |
| 1362 | Orlen | 21 |
2019 |
| 1363 | OS Integration | 66 |
1996, 1998, 2000 - 2001 |
| 1364 | Osama | 96 |
1989 - 1991, 1993 - 1994, 1996 |
| 1365 | Ouilleres | 16 |
1999 |
| 1366 | Ovoro | 7 |
1976 |
| 1367 | Oxigen | 8 |
2010 |
| 1368 | Ozalid | 51 |
2002 - 2004 |
| 1369 | OZJet | 19 |
2005 |
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