Races in calendar week 16/2006
All motorsport events on the weekend of 21–23 Apr 2006.
| Circuit | Country | Series |
|---|---|---|
| Danville (Virginia Raceway) |  USA |
|
| Imola |  Italy |
|
| Motegi (oval) |  Japan |
|
| Oschersleben |  Germany |
|
| Pukekohe Park |  New Zealand |
|
| Wakefield Park |  Australia |
|