Races in calendar week 41/2003
All motorsport events on the weekend of 10–12 Oct 2003.
| Circuit | Country | Series |
|---|---|---|
| Cascavel |  Brazil |
|
| Fort Worth (oval) |  USA |
|
| Jerez |  Spain |
|
| Mexico City |  Mexico |
|
| Oschersleben |  Germany |
|
| Suzuka |  Japan |
|
| Vallelunga |  Italy |
|