The Dallara F2 2018 was an open-wheel racing car developed by Italian manufacturer Dallara for use in the FIA Formula 2 Championship, a feeder-series for Formula One until being replaced by the Dallara F2 2024 from the 2024 season onwards. The F2 2018 was the second car used by the FIA Formula 2 Championship and was introduced for the 2018 championship as a replacement for the aging Dallara GP2/11 chassis. As the Formula 2 Championship is a spec series, the F2 2018 was raced by every team and driver competing in the series as a cost-control method. The F2 2018 was Dallara's first ever turbo-powered Formula 2 car and also the first turbo-powered Formula 1 junior feeder-series car since the Dallara GP3/10 in the GP3 Series.

An open-wheel car is a car with the wheels outside the car's main body, and usually having only one seat. Open-wheel cars contrast with street cars, sports cars, stock cars, and touring cars, which have their wheels below the body or inside fenders. Open-wheel cars are built both for road racing and oval track racing. Open-wheel cars licensed for use on public roads, such as the Ariel Atom, are uncommon, as they are often impractical for everyday use.