The 2018 Intercontinental GT Challenge was the third season of the Intercontinental GT Challenge. The season featured four rounds, starting with the Liqui Moly Bathurst 12 Hour on 4 February and concluding with the California 8 Hours on 28 October. Markus Winkelhock was the defending Drivers' champion and Audi was the defending Manufacturers' champion. The series reverted to rules of the inaugural season, where each manufacturer was permitted to nominate up to four cars in each event. In 2017 all cars and drivers scored points towards the championship.