The 2018 Monza GP3 Series round was the seventh round of the 2018 GP3 Series. It was held on 1 and 2 September 2018 at Autodromo Nazionale Monza in Monza, Italy. The race supported the 2018 Italian Grand Prix.

The 2018 GP3 Series was the ninth and final season of the second-tier of Formula One feeder championship and also ninth and final season under the moniker of GP3 Series, a motor racing feeder series that runs in support of the 2018 FIA Formula One World Championship and sister series Formula 2. This was the final contested season of GP3, as the series united with the FIA Formula 3 European Championship to form the FIA Formula 3 Championship.