Races in calendar week 40/2004
All motorsport events on the weekend of 1–3 Oct 2004.
| Circuit | Country | Series |
|---|---|---|
| Barcelona |  Spain |
|
| Brands Hatch |  Great Britain |
|
| Curitiba |  Brazil |
|
| Danville (Virginia Raceway) |  USA |
|
| Fontana (oval) | USA |
|
| Hockenheim |  Germany |
|
| Mine |  Japan |
|