British Salmson was a British based manufacturer of cars, from 1934 to 1939. An offshoot of the French Salmson company, it was taken over by local management. After producing war supplies during World War II, it ceased car production, moved to Glasgow, Scotland, and produced printing machinery.

The S6D or 20/90 of 1936 to 1939 had no French equivalent. The engine was a six-cylinder unit of 2580 cc, still with twin overhead cams and the car was available as either Sports Saloon, 2-seater sports or drophead coupé. A maximum speed of nearly 90 mph (140 km/h) was claimed. Bendix cable brakes were fitted to the first few cars but later ones had Lockheed hydraulics. About 15 were made up to the outbreak of war.