The 2015 Avon Tyres British GT season was the 23rd season of the British GT Championship. The season began on 6 April at Oulton Park and finished on 13 September at Donington Park, after nine rounds held over seven meetings. Beechdean Motorsport won both the GT3 and GT4 drivers championships. Team owner Andrew Howard won his second title with Jonathan Adam in GT3 while Jamie Chadwick and Ross Gunn claimed honours in GT4.