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 and stroke of .