FMSN
| Acronym | Definition |
|---|---|
| FMSN | Fabrika Motora Specijalne Namjene (Serbian: Engine Factory Special Purposes) |
| FMSN | Fonds Mondial de Solidarité Numérique (French: Global Digital Solidarity Fund; Tunisia) |
| FMSN | Tanandava Samangoky (Madagascar airport code) |
| FMSN | Fédération Mondiale des Sociétés de Neurochirurgie (French: World Federation of Neurosurgical Societies) |