Automobiles Gonfaronnaises Sportives (also known as AGS and Gonfaron Sports Cars) was a small French racecar constructor that competed in various racing categories over a period of thirty years, including Formula One from 1986 to 1991.

AGS survived as a prosperous Formula One driving school, in Le Luc, near Gonfaron.

The team was founded by the French mechanic, Henri Julien, who ran a filling station, the "Garage de l'Avenir", in Gonfaron, a provincial French village. In the late 1950s and early 1960s, Julien regularly attended racing events in minor classes. Although not an outstanding driver, the technical knowledge he gained eventually prompted him to start constructing racing cars.^{[citation needed]}

Julien's first car, the AGS JH1, saw the light of day in 1969. It was a small single-seater, intended for the category of "Formule France". The car was designed by Julien's former apprentice, the Belgian mechanic Christian Vanderpleyn, who had been with the garage (and the racing team) since the very late 1950s and who would stay on until 1988. Soon, AGS went progressed and manufactured its own Formula 3 cars, which were ambitious but not good enough to compete seriously with the state-of-art Martinis which dominated the series at the time.

AGS took another step ahead in 1978 when the team started competing in the European Formula 2 Championship. Still, the car - by now the AGS JH15 - was self-penned (by Vanderpleyn), self-built and self-run. Formula 2 was a difficult task for the small team, racing 1978 and 1979 without scoring any championship points. The early 1980s were somewhat better. AGS was one of the few teams who ran its own cars (Maurer, Minardi and Merzario were the others), and eventually the team was able to score points regularly. Soon some victories came, too. AGS made history when works driver Philippe Streiff won the final race of Formula 2 in 1984, using an AGS JH19C.

In 1985, AGS switched to Formula 3000 with the JH20, based on the Duqueine VG4 Formula 3 chassis. The JH20 used a Cosworth DFV engine supplied through the Swiss tuning firm Mader. Results were mediocre in 1985 and 1986.

By late summer 1986, AGS entered the Italian Grand Prix in Monza, its first Formula One race. Its structure was somewhat bizarre: The team had no more than seven employees and was still operated from the Garage de l'Avenir in Gonfaron.

AGS appeared with a car that was once again penned by Vanderpleyn. The JH21C was a strange mixture between former AGS F3000 vehicles and Renault F1 parts which were used extensively. The car was powered by a well-used Motori Moderni turbo engine (the only time these Carlo Chiti-developed engines were given to a customer team) and driven by Italian Ivan Capelli. A few weeks before, the car had been tested at Paul Ricard by Didier Pironi, driving an F1 car for the first time since his leg-breaking accident in the 1982 German Grand Prix. Due to technical difficulties, neither in its first attempt nor in the following race in Portugal did Capelli see the finish.