Manufacture d'armes de Saint-Étienne
| Company type | Government-owned corporation (subsidiary of Nexter defense conglomerate) | 
|---|---|
| Industry | Weapons | 
| Founded | 1764 | 
| Defunct | 2001 | 
| Fate | Annexed | 
| Successor | Nexter | 
| Headquarters | ,  France  | 
| Products | Rifles, pistols, tanks, weapon systems | 
The Manufacture d'Armes de Saint-Étienne, often abbreviated to MAS ("Saint-Étienne Weapons Factory" in English), was a French state-owned weapons manufacturer in the town of Saint-Étienne, Loire. Founded in 1764, it was merged into the French state-owned defense conglomerate GIAT Industries in 2001.