2003 British Formula 3 International Series

The 2003 British Formula Three season was the 53rd British Formula Three Championship season. It commenced on 6 April, and ended on 28 September after twenty-four races.

The scoring system was 20-15-12-10-8-6-4-3-2-1 points awarded to the first ten finishers, with one extra point added to the driver who set the fastest lap of the race. If a Class B driver finished among the top finishers, he would not score points for the main championship, and the points would be awarded to the next driver in the standings.