The 1981 Australian Sports Sedan Championship was an Australian motor racing competition for Group B Sports Sedans. It was sanctioned by the Confederation of Australian Motor Sport and was the sixth Australian Sports Sedan Championship.

The National Sports Sedans Series, formerly the Australian Sports Sedan Championship, is a Motorsport Australia-sanctioned national motor racing title for drivers of cars complying with Australian Sports Sedan regulations. This class, essentially a silhouette racing car class, permits three types of cars:Purpose-built steel spaceframe racing cars with bodywork resembling a production car sold in Australia Cars based on production street car bodies. Purpose-built race cars constructed for the American Trans-Am Series.