The 2021 Super Taikyu Series Powered by Hankook was the thirty-first season of the Super Taikyu Series endurance racing championship. It began on 21 March at Twin Ring Motegi and ended on 14 November at Okayama International Circuit.
D'station Racing won the championship in the series' GT3 category, known as ST-X, with an Aston Martin Vantage AMR GT3.
This was the first season for the new ST-Q class, introduced for manufacturer-developed, non-homolgated special racing vehicles. In this class, Toyota and ROOKIE Racing introduced the Toyota Corolla H2 Concept, a hydrogen internal combustion engine vehicle based upon the Toyota Corolla Sport hatchback.[1] This car made its racing debut at the Fuji SUPER TEC 24 Hours.[2] Mazda debuted the Mazda Demio Bio Concept in the final round at Okayama, which ran on renewable biodiesel fuel.[3]