The 1977 Formula One season was the 31st season of FIA Formula One motor racing. It featured the 28th World Championship of Drivers and the 20th International Cup for Formula 1 Constructors. The season commenced on 9 January 1977 and ended on 23 October after seventeen races, making it the longest Formula One season in the sport's history at the time. The season also included a single non-championship race for Formula One cars, the 1977 Race of Champions.

Formula One, commonly known as Formula 1 or F1, is the highest class of international racing for open-wheel single-seater formula racing cars sanctioned by the Fédération Internationale de l'Automobile (FIA). The FIA Formula One World Championship has been one of the world's premier forms of racing since its inaugural running in 1950. The word formula in the name refers to the set of rules all participants' cars must follow. A Formula One season consists of a series of races, known as Grands Prix. Grands Prix take place in multiple countries and continents on either purpose-built circuits or closed public roads.