The Auster D.6 was a four-seat British light aircraft, a development of the Auster Autocar with a horizontally-opposed engine. It was available with a choice of two engines, a 160 hp Lycoming O-320 or 180 hp Lycoming O-360. When Auster was taken over by Beagle Aircraft in September 1960, development of the D.6 was dropped, while the D.4 and D.5 continued production.