The 1984 FIA Formula One World Championship was the 38th season of FIA Formula One motor racing. It featured the 1984 Formula One World Championship for Drivers and the 1984 Formula One World Championship for Manufacturers, which were contested concurrently over a sixteen-race series that commenced on 25 March and ended on 21 October. In the Drivers' Championship, the season became a duel between McLaren drivers Alain Prost and Niki Lauda. Prost won seven races to Lauda's five, including the last two races of the season, but Lauda eventually prevailed by half a point – the smallest margin in Formula One history. It was Lauda's third title, and his first since 1977. McLaren comfortably won the Manufacturers' Championship, their first since 1974. This season featured the last driver of the 20th century to compete in both the F1 championship and the Indianapolis 500 in the same season, Italy's Teo Fabi. No driver would repeat this feat until 2017, when Fernando Alonso also participated at the Indy 500.