The Austin 15/20 (or 15-20 hp) was the second automobile produced by the newly established Austin Motor Company in 1906 after the initial 25/30 model.
Only four models of the 15/20 were manufactured at the Longbridge plant and the model was quickly replaced by the Austin 18/24 in 1907.
The 15/20 had a wheelbase of 2,972? mm (117.0 in) and weighed 864? kg (1,900 lb). It was powered by a 4.4-litre (4399 cc) 4-cylinder engine. The cars were fitted with a four-speed gearbox.