The Nieuport 27 was a French biplane fighter aircraft produced during World War I. It was an evolution of the successful Nieuport 17 and 24 fighters, and it was designed to be an improvement in terms of speed and performance.

The Nieuport 27 featured a streamlined fuselage and a more powerful engine than its predecessors, which allowed it to reach a top speed of around 200 km/h. It was armed with two synchronized Vickers machine guns, which were mounted on the fuselage and fired through the propeller arc.

The Nieuport 27 entered service with the French Air Service in late 1917, and it saw extensive use throughout World War I, both as a fighter and a reconnaissance aircraft. It was also used by several other countries, including Italy and Russia.

The Nieuport 27 was highly maneuverable and agile, and it was known for its excellent handling characteristics. Its improved speed and performance also made it a formidable opponent for many of the aircraft it faced in combat. However, like its predecessors, the Nieuport 27 was relatively lightly armed and armored, and it was known for being somewhat fragile in combat.

Despite its limitations, the Nieuport 27 remained a popular and effective aircraft throughout World War I, and it played an important role in maintaining air superiority during the latter years of the conflict.