The 2008 FIA GT Championship season was the twelfth season of the FIA GT Championship. It featured a series for Grand Touring style cars broken into two classes based on power and manufacturer involvement, called GT1 and GT2. Invitational G2 and G3 classes were also allowed to participate but cars in these classes were not eligible to score points. The Championship began on 20 April 2008 and ended on 23 November 2008 after 10 rounds.
The official 2008 calendar was released by the FIA on 24 October 2007. All races were two hours, with exception of the Spa 24 Hours and the Bucharest City Challenge, the latter being a combination of two one-hour races, each awarding half points. The Adria round remained as a night event and the Argentinian finale was the first South American race in FIA GT Championship history.
Points were awarded to the top 8 finishers in the order of 10–8–6–5–4–3–2–1 except at the Spa 24 Hours, where half points were also granted for the leaders after 6 and 12 hours. Both cars scored points towards the championship regardless of finishing position. The G2 class did not have a championship.
Points were awarded to the top 8 finishers in the order of 10–8–6–5–4–3–2–1 except at the Spa 24 Hours. Drivers who did not drive the car for a minimum of 35 minutes did not score points.
The Citation Cup, which was limited to non-professional drivers competing in GT1 cars, did not include the Spa 24 Hours (Round 6) and the San Luis 2 Hours (Round 10).