Le Rhône was the name given to a series of popular rotary aircraft engines produced in France by Société des Moteurs Le Rhône and the successor company of Gnome et Rhône. They powered a number of military aircraft types of the First World War. Le Rhône engines were also produced under license worldwide.

Although not powerful (the largest wartime version produced 130 horsepower (97 kW)), they were dependable rotary engines.^[1] The Le Rhône 9 was a development of the Le Rhône 7, a seven-cylinder design. Examples of nine-cylinder Le Rhône rotary engines are on public display in aviation museums with several remaining airworthy, powering vintage aircraft types.