| Société nationale des constructions aéronautiques de l'ouest | |
| Fate: | Acquired (nationalization) |
| Predecessor: | Breguet, (Bouguenais) Loire (St Nazaire) Nieuport (Issy-les-Moulineaux) |
| Successor: | SNCASO (merged) |
| Foundation: | 1936 |
| Location Country: | France |
| Industry: | Aerospace, defence |
| Products: | Aircraft |
SNCAO (abbreviated from Société nationale des constructions aéronautiques de l'ouest) was a state-owned French aircraft manufacturer, which originated on November 16, 1936, from the merger of the factories of Breguet in Bouguenais, and Loire-Nieuport in St Nazaire and Issy-les-Moulineaux.
The company had been formed as one of six state-owned Société Nationales in the 1936 nationalistation of military industries; at the end of 1940 these were re-organised and SNCAO was absorbed by SNCASO. In 1957 SNCASO was merged into Sud Aviation.