The 1983 British Formula Three Championship was the 33rd season of the British Formula Three Championship, starting at Silverstone on 6 March and concluding at Thruxton on 23 October after 20 races. The 1983 season is among the most fondly remembered in the history of the championship due to the head-to-head title battle between future Formula One stars Ayrton Senna and Martin Brundle - both driving Toyota-powered Ralt chassis, prepared by West Surrey Racing and Eddie Jordan Racing respectively. Senna built up a commanding advantage by winning the first nine races in succession, but a series of retirements for the Brazilian later in the year allowed Brundle to close the gap. The Brit took the points lead heading into the series finale, but Senna dominated the race to secure the title.