The Salmson 9 AD was a family of air-cooled nine cylinder radial aero-engines produced in the 1930s in France by the Société des Moteurs Salmson.

The 9 AD followed Salmson practice after the First World War, of being air-cooled and utilising the Canton-Unne epicyclic geared crank-case system.

The major attributes of the engine include a bore of 70 mm (2.76 in) and stroke of 86 mm (3.39 in).