FNSS Defence Systems
| Company type | Public limited company | 
|---|---|
| Industry | Defence | 
| Founded | 1988 | 
| Headquarters | , Turkey | 
| Area served | Worldwide | 
| Products | Armored combat vehicles Weapon systems | 
| Services | Upgrade & Modernisation Integrated logistics support services | 
| Revenue | 
 | 
| Number of employees | 782 | 
| Website | Official website | 
FNSS Savunma Sistemleri A.Ş. (English: FNSS Defence Systems A.Ş.) is a Turkish defense manufacturer founded in 1988. It is owned 51% by Nurol Holding of Turkey and 49% by British–American firm BAE Systems Inc., and operates facilities located in Gölbaşı, Ankara.
FNSS was founded as a joint venture between FMC Corporation and Nurol Holding as FMC Nurol Savunma Sanayii A.Ş. It is a major supplier of tracked and wheeled armored vehicles and weapon systems for the Turkish Armed Forces and Allied Armed Forces.