The 1974 British Formula Three season was the 24th season of the British Formula 3 season. It consisted of two championships. The 1974 B.A.R.C. Forward Trust British F3 Championship and the 1974 MCD Lombard North Central F3 Championship. Both of which were won by Brian Henton.
Brian Henton dominated the season taking home 15 victories and his team March Engineering Ltd taking home 18 overall. GRD as a constructor took home seven wins and modus took home one.
The season was started with reliability issues with only 5 cars starting the opening race. As the season progressed with March's dominance only GRD could put up a challenge to their dominant machinary.
Champion: Brian Henton
Runner-up: Tony Rouff
Ran over 13 rounds, the scoring system was 9-6-4-3-2-1 points to the first six classified finishers.
Champion: Brian Henton
Runner-up: Alex Dias Ribeiro
Ran over 14 rounds, the scoring system was 9-6-4-3-2-1 points to the first six classified finishers with double points on the last race.