The 1975 United States Grand Prix was a Formula One motor race held on October 5, 1975, at the Watkins Glen Grand Prix Race Course in Watkins Glen, New York. It was race 14 of 14 in both the 1975 World Championship of Drivers and the 1975 International Cup for Formula One Manufacturers. It was the 25th United States Grand Prix since the first American Grand Prize was held in 1908 and the 18th since the first United States Grand Prix at Riverside in 1958.

Watkins Glen International, nicknamed "The Glen", is an automobile race track located in the town of Dix just southwest of the village of Watkins Glen, New York, at the southern tip of Seneca Lake. It was long known around the world as the home of the Formula One United States Grand Prix, which it hosted for twenty consecutive years (1961–1980). In addition, the site has also been home to road racing of nearly every class, including the World Sportscar Championship, Trans-Am, Can-Am, NASCAR Cup Series, the International Motor Sports Association and the IndyCar Series. The facility is currently owned by NASCAR.