Races in calendar week 38/2005
All motorsport events on the weekend of 23–25 Sep 2005.
| Circuit | Country | Series |
|---|---|---|
| Adria |  Italy |
|
| Brands Hatch |  Great Britain |
|
| Fuji |  Japan |
|
| Las Vegas (oval) |  USA |
|
| Monza | Italy |
|
| Sao Paulo |  Brazil |
|
| Watkins Glen | USA |
|