The 2021 Gran Turismo D1 Grand Prix series was the twenty-first season of D1 Grand Prix started on April 24 at Okuibuki Motopark and ended on November 21 at Ebisu Circuit.
Masanori Kohashi was the defending champion.
Source : 2021 D1GP Drivers
Note : Round 5 and 6 supposed to be held on August 21 and 22, but were postponed due to the rising COVID-19 cases in Japan. The event was moved to November 20 and 21 but the event was not renamed.
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Bold : Tanso (Single-run) Winner
Source : 2021 D1GP Series ranking