The 1980 British Formula Three season (known as the 1980 Vandervell British Formula 3 Championship for sponsorship reasons) was the 30th season of the British Formula Three Championship. Swedish driver Stefan Johansson won the championship racing for Project Four Racing.

Johansson took the title by two points from title rivals Kenneth Acheson and Roberto Guerrero. At the start of the season, most of the front-runners used the March 803. However, by Round 7 in Snetterton, Acheson had changed to the March 793 and became the man to beat along with Guerrero. In the latter half of the season, Johansson changed from the 803 to the Ralt RT3, winning the last four races. It was also the last Britifh Formula 3 season for Nigel Mansell as he moved into Formula One to drive for Lotus.