The 2019 FIA Formula 3 Championship was the inaugural season of the FIA Formula 3 Championship, a multi-event motor racing championship for single-seat open-wheel formula racing cars. The championship featured drivers competing in 3.4-litre Formula 3 racing cars which conform to the technical regulations, or formula, of the championship. It ran in support of the Formula 1 World Championship and its sister series, the FIA Formula 2 Championship. It serves as the third tier of formula racing in the FIA Global Pathway. The championship was formed by the merger of the GP3 Series and the FIA Formula 3 European Championship in 2018, which brought the two championships under the umbrella of the Fédération Internationale de l'Automobile (FIA). The Formula One theme song composed by Brian Tyler, which debuted in the 2018 F1 season, would be used in Formula 3 broadcasts.

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.