The 2021 Sochi Formula 3 round was the final race of the 2021 FIA Formula 3 Championship.

It took place at the Sochi Autodrom and featured three races from 24 to 26 September in support of the 2021 Russian Grand Prix.

Dennis Hauger clinched the drivers' championship in the first race after a second-placed finish.

However, Trident clinched their first teams' championship ever in Formula 3 after securing a double podium lock-up in the Feature Race, with Jack Doohan winning his fourth race of the season whilst teammate Clément Novalak finished third.

Sprint Race 2 was cancelled due to adverse weather conditions.