The SS Jaguar 100 is a British 2-seat sports car built between 1936 and 1939 by SS Cars Ltd of Coventry, England. The manufacturer's name 'SS Cars' used from 1934 maintained a link to the previous owner, Swallow Sidecar, founded in 1922 by Walmsley and Lyons to build motorcycle sidecars. In March 1945 the S. S. Cars shareholders agreed to change the name to Jaguar Cars Limited.

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.