The Nieuport 12 (or Nieuport XII in contemporary sources) was a French sesquiplane reconnaissance, fighter aircraft and trainer used by France, Russia, Great Britain and the United States during World War I. Later production examples were built as trainers and served widely until the late 1920s.
To improve the performance of the Nieuport 10 a re-engined version was developed as the Nieuport 12 with a significantly enlarged upper wing. A Lewis gun was fitted to the rear cockpit for use by the observer, normally on an Etévé ring (known as the Nieuport ring in British service) although early examples used a pedestal mount or half ring. A second Lewis was sometimes fitted to fire over the top wing. Nieuport 12s built by Beardmore used by the Royal Flying Corps were sometimes fitted with a Scarff ring instead of the Nieuport ring, and a synchronized Vickers gun for the pilot. Additional modifications were made to those built by Beardmore.
It could be fitted with either a Clerget, Clerget 9B engine or Le Rhône 9J mounted in the nose.
A single ex-French Nieuport 12 is on display following an extensive restoration (including reinstalling the original Le Rhône 9J rotary engine) at the Canada Aviation and Space Museum in Ottawa in the late 1990s. This aircraft was donated to the Canadian Dominion Archives along with a Canon de 75 modèle 1897 cannon and an extensive collection of propaganda posters by the French Government in 1916 and was used for war bond drives until the 1918 flu pandemic resulted in it being placed in storage. In the late 1960s the Royal Canadian Air Force partially converted it into an RFC Beardmore example for display.