"The Belgian National Sporting Authority, the RACB, has written to notify the FIA of the withdrawal of the 2006 Belgian Grand Prix from the FIA Formula One World Championship," the FIA, the sport's ruling body, said in a statement.
"The withdrawal has been made in order to allow the completion of extensive improvement work to facilities at the Spa-Francorchamps circuit."
The FIA said it hoped the grand prix would be raced from 2007 onwards.
Formula One supremo Bernie Ecclestone had been in negotiations with the regional government of southern Wallonia about the race's future.
