The 1973 British Formula Three season was the 23rd season of the British Formula 3 season. It consisted of three championships. Tony Brise won the John Player and Lombard F3 (shared with Richard Robarts) Championships, whilst Ian Taylor won the Forward trust Championship.
Champion: Ian Taylor
Runner-up: Tony Brise
Ran over 14 rounds, the scoring system was 9-6-4-3-2-1 points to the first six classified finishers.
Champion: Tony Brise
Runner-up: Alan Jones
Ran over 14 rounds, the championship used a 20-15-12 points system with double points at the final race.
Champions: Tony Brise, Richard Robarts
Runner-up: Mike Wilds
Ran over 11 rounds, the scoring system was 9-6-4-3-2-1 points to the first six classified finishers. Double points were awarded at the last race and the fastest lap was worth 1 or 2 points.