Races in calendar week 21/2003
All motorsport events on the weekend of 23–25 May 2003.
| Circuit | Country | Series |
|---|---|---|
| Brno |  Czechia |
|
| Enna (Pergusa) |  Italy |
|
| Indianapolis (oval) |  USA |
|
| Nürburgring |  Germany |
|
| Rio de Janeiro (Jacarepagua) |  Brazil |
|
| Silverstone |  Great Britain |
|
| Sugo |  Japan |
|
| Winton Raceway |  Australia |
|