The 1953 Formula One season was the seventh season of the FIA's Formula One racing. It consisted only of a number of non-championship motor races. As in 1952, the FIA chose to limit all Grand Prix races counting towards the World Championship of Drivers to cars complying with Formula Two regulations rather than with Formula One. The 4th FIA World Championship of Drivers, which commenced on 18 January and ended on 13 September after nine races, was won by Alberto Ascari, driving for a Scuderia Ferrari. Ascari became the first driver to successfully defend his title.