The 1931 French Grand Prix was a Grand Prix motor race held at Autodrome de Linas-Montlhéry on 21 June 1931. As with the other two races in the 1931 AIACR European Championship, this race was held over 10 hours, not over a fixed distance. As a result, most cars had two drivers.

The French Grand Prix, formerly known as the Grand Prix de l'ACF, is an auto race held as part of the Fédération Internationale de l'Automobile's annual Formula One World Championship. It is one of the oldest motor races in the world as well as the first "Grand Prix". It ceased, shortly after its centenary, in 2008 with 86 races having been held, due to unfavourable financial circumstances and venues. The race returned to the Formula One calendar in 2018 with Circuit Paul Ricard hosting the race, but was removed from the calendar after 2022.