The 2021 ADAC GT Masters was the fifteenth season of the ADAC GT Masters, the grand tourer-style sports car racing founded by the German automobile club ADAC.
Montaplast drivers Ricardo Feller and Christopher Mies won the title in a closely-fought battle with SSR Performance's Michael Ammermüller and Mathieu Jaminet.
The round at Nürburgring planned in 6-7 August was postponed after massive flooding in Germany. The new date was set to 6-7 November, making it the series finale.
Points were awarded to the top 15 classified finishers in each race.