2013 British GT Championship
The 2013 Avon Tyres British GT season was the 21st season of the British GT Championship. The season began on 30 March at Oulton Park and finished on 6 October at Donington Park, after ten rounds held over seven meetings. Beechdean Motorsport team principal Andrew Howard won the GT3 category in an Aston Martin V12 Vantage GT3, Optimum Motorsport's Ryan Ratcliffe and Rick Parfitt Jr. won the GT4 championship, driving a Ginetta G50 while Paul Bailey and Andy Schulz took the GTC title in a Ferrari 458 Challenge, driving for Horsepower Racing.
Entry list
The SRO released the entry list on 7 March at the season launch, containing 27 GT3 and 6 GT4 full season entries.Race calendar and results
The 2013 calendar was announced on 13 September 2012. A revised calendar was released on 6 December 2012, with Zandvoort replacing the Nürburgring. All races except Dutch round at Zandvoort, were held in the United Kingdom.| Round | Circuit | Date | Length | Pole Position | GT3 Winner | GT4 Winner |
| 1 | Oulton Park | 1 April | 60 mins | No. 15 Fortec Motorsports | No. 33 Trackspeed | No. 43 Century Motorsport |
| 1 | Oulton Park | 1 April | 60 mins |  Ollie Hancock Benji Hetherington | Phil Keen Jon Minshaw | Declan Jones Zoë Wenham |
| 2 | Oulton Park | 1 April | 60 mins | No. 3 Rosso Verde | No. 31 Trackspeed | No. 43 Century Motorsport |
| 2 | Oulton Park | 1 April | 60 mins | Hector Lester Allan Simonsen | Nick Tandy David Ashburn | Declan Jones Zoë Wenham |
| 3 | Rockingham | 6 May | 120 mins | No. 31 Trackspeed | No. 32 Trackspeed | No. 53 Complete Racing AMR |
| 3 | Rockingham | 6 May | 120 mins | Nick Tandy David Ashburn | Richard Westbrook Gregor Fisken | Tom Wilson Steve Chaplin |
| 4 | Silverstone Arena | 26 May | 180 mins | No. 79 Ecurie Ecosse | No. 79 Ecurie Ecosse | No. 408 PROsport Performance |
| 4 | Silverstone Arena | 26 May | 180 mins | Oliver Bryant Marco Attard | Oliver Bryant Marco Attard |  Jörg Viebahn Adam Christodoulou |
| 5 | Snetterton | 16 June | 60 mins | No. 10 M-Sport Racing | No. 1 Oman Air Motorbase | No. 44 Optimum Motorsport |
| 5 | Snetterton | 16 June | 60 mins | Warren Hughes Rembert Berg | Michael Caine Ahmad Al Harthy | Ryan Ratcliffe Rick Parfitt, Jr. |
| 6 | Snetterton | 16 June | 60 mins | No. 32 Trackspeed | No. 31 Trackspeed | No. 44 Optimum Motorsport |
| 6 | Snetterton | 16 June | 60 mins | Stephen Jelley Gregor Fisken | Nick Tandy David Ashburn | Ryan Ratcliffe Rick Parfitt, Jr. |
| 7 | Brands Hatch GP | 11 August | 120 mins | No. 888 888Optimum | No. 007 Beechdean Motorsport | No. 44 Optimum Motorsport |
| 7 | Brands Hatch GP | 11 August | 120 mins | Daniel Brown Steve Tandy | Jonathan Adam Andrew Howard | Ryan Ratcliffe Rick Parfitt, Jr. |
| 8 | Zandvoort | 7 September | 60 mins | No. 1 Oman Air Motorbase | No. 1 Oman Air Motorbase | No. 50 Redgate/Lifetime Racing |
| 8 | Zandvoort | 7 September | 60 mins | Michael Caine Ahmad Al Harthy | Michael Caine Ahmad Al Harthy | Matt Smith Dan Eagling |
| 9 | Zandvoort | 8 September | 60 mins | No. 31 Trackspeed | No. 31 Trackspeed | No. 45 Blendini/Triple-R |
| 9 | Zandvoort | 8 September | 60 mins | Nick Tandy David Ashburn | Nick Tandy David Ashburn | Rory Bryant David Barker |
| 10 | Donington Park | 6 October | 120 mins | No. 8 888Optimum | No. 25 United Autosports | No. 43 Century Motorsport |
| 10 | Donington Park | 6 October | 120 mins | Joe Osborne Lee Mowle | Matt Bell Mark Patterson | Declan Jones Nathan Freke |
Championship standings
- Points are awarded as follows:
GT3/GTC