The Morane-Saulnier N, also known as the Morane-Saulnier Type N, was a French monoplane fighter aircraft of the First World War. Designed and manufactured by Morane-Saulnier, the Type N entered service in April 1915 with the Aéronautique Militaire designated as the MoS-5 C1. It also equipped four squadrons of the Royal Flying Corps, in which it was nicknamed the Bullet, and was operated in limited numbers by the 19th Squadron of the Imperial Russian Air Force.

Fighter aircraft are military aircraft designed primarily for air-to-air combat. In military conflict, the role of fighter aircraft is to establish air superiority of the battlespace. Domination of the airspace above a battlefield permits bombers and attack aircraft to engage in tactical and strategic bombing of enemy targets.