2021 GB3 Championship

The 2021 season was the sixth organised by the British Racing Drivers' Club in the United Kingdom.

The championship featured a mix of professional motor racing teams and privately funded drivers, and also featured the 2-litre 230-bhp Tatuus-Cosworth single seat race car in the main series.

The season ran over eight triple- and quadruple-header rounds, it started on 22 May at Brands Hatch and ended on 17 October at Donington Park.

[1] The series was rebranded mid-season from BRDC British Formula 3 Championship.

Race three, which had its grid formed by reversing the qualifying order, awarded extra points for positions gained from the drivers' respective starting positions.