The 2006 British Formula 3 International Series was the 56th British Formula 3 International Series season. It commenced on 17 April 2006 and ended on 1 October after twenty-two races.
The following teams and drivers were competitors in the 2006 British Formula 3 International Series. The National class is for year-old Formula Three cars. Teams in the Invitation class are not series regulars, and do not compete for championship points.