Loire Aviation was a French aircraft manufacturer in the inter-war period, specializing in seaplanes, and based in Saint-Nazaire, France.

The company started as a joint venture between ACL and Gourdou-Leseurre, contracting to build 257 GL 32’s under licence at a new factory at St Nazaire.

In 1933 the company united with Nieuport (by then known as Nieuport-Astra), though both companies maintained their own factories and test sites; Loire at St Nazaire and La Baule, Nieuport at Issy-les-Moulineaux and Villacoublay.

This led to some complications; the two companies found themselves competing over a contract for a fighter for the French Air Force, later won by Morane Saulnier with the MS 406.

In 1936 Loire-Nieuport was nationalized and united with Breguet of Bouguenais, near Nantes, to form the Société Nationale des Constructions Aéronautiques de l'Ouest (SNCAO).