The 2005 British Formula 3 International Series was the 55th British Formula 3 International Series season. It commenced on 2 April 2005 and ended on 9 October after twenty two races.
Drivers and teams
The following teams and drivers were competitors in the 2005 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.