The 2020 Monza FIA Formula 3 round is a motor racing event held on 5 and 6 September 2020 at the Autodromo Nazionale di Monza in Monza, Italy. It was the penultimate round of the 2020 FIA Formula 3 Championship, and ran in support of the 2020 Italian Grand Prix. With Frederik Vesti's win and Oscar Piastri finishing in third in the first race, Prema Racing prematurely secured the teams' championship back-to-back with three races to spare.