SS Cars was a British manufacturer of sports saloon cars from 1934 until wartime 1940, and from March 1935 of a limited number of open 2-seater sports cars. From September 1935, their new models displayed a new name: SS Jaguar. By then, its business, which was founded in 1922, was run by and largely owned by William Lyons. Lyons had been partner with 1922 co-founder William Walmsley until Walmsley sold his shareholding in January 1935.

Sir William Lyons, known as "Mr. Jaguar", was with fellow motorcycle enthusiast William Walmsley, the co-founder in 1922 of the Swallow Sidecar Company, which became Jaguar Cars Limited after the Second World War.