The Nieuport 24 was a French sesquiplane fighter aircraft during World War I designed by Gustave Delage as a replacement for the successful Nieuport 17. In the event its performance was little better than the type it was meant to replace, which was largely superseded by the SPAD S.7 instead. Operational Nieuport 24s served with French, British and Russian units, and the type also served widely as an advanced trainer.
The Nieuport 24 introduced a new fuselage of improved aerodynamic form, rounded wingtips, and a tail unit incorporating a small fixed fin and a curved rudder. The tailskid was sprung internally and had a neater appearance than that on earlier Nieuports. A 130 hp Le Rhône rotary engine was fitted.
There were initial structural problems with the new tail, and most production aircraft of the type were of the Nieuport 24bis model, which retained the fuselage and wings of the 24, but reverted to the Nieuport 17 type tailplane, tailskid and rectangular balanced rudder. The new tail was finally standardised on the Nieuport 27.
A batch of Nieuport 24bis were built in England for the Royal Naval Air Service.
The standard armament of the Nieuport 17 (a synchronised Vickers in French service - a Lewis gun on a Foster mounting on the top wing in British service) was retained to save weight and retain a good performance, although many 24s were used as advanced trainers and normally flown without guns.