Races in calendar week 21/2006

All motorsport events on the weekend of 26–28 May 2006.

Circuit	Country	Series
Brno	Czechia	Race results available (full) FIA GT Championship 2006
Indianapolis (oval)	USA	Race results available (full) IRL IndyCar Series 2006 Race results available (full) IRL Infiniti Pro Series 2006
Lakeville (Lime Rock)	USA	Race results available (full) Grand-Am Sports Car Series 2006
Monte Carlo	Monaco	Race results available (full) FIA Formula 1 World Championship 2006 Race results available (full) GP2 Series 2006 Race results available (full) Formula Renault 3.5 World Series 2006 Race results available (full) Porsche Supercup 2006
Motegi	Japan	Race results available (full) Formula Nippon 2006 Race results available (full) All-Japan Formula 3 Championship 2006
Nürburgring	Germany	Race results available (full) German Formula-3-Cup 2006