A Riley 12/6 was a car made by the British Riley company from 1933 to 1935.

It had a 1458cc straight six engine with twin cams and either twin or triple S.U carburettors. The transmission was either a four speed manual or optional preselector gearbox. They were capable of a top speed of around 70 mph. The chassis was a lengthened version of the one used on the Riley Nine.

They were available in Mentone saloon, Kestrel saloon, Lincock fixed head coupé, Ascot drophead coupé, Lynx tourer, Falcon saloon, Gamecock tourer and March two seat tourer.