FOSM
| Acronym | Definition |
|---|---|
| FOSM | Foundation Open Society-Macedonia (est. 1992) |
| FOSM | Fort Smith National Historic Site (US National Park Service) |
| FOSM | Flag Officer Submarines |
| FOSM | First Order-Second Moment Analysis |
| FOSM | Friends of St. Michael's |
| FOSM | Free and Open Source Movement (software) |
| FOSM | Friends of Saddle Mountain (Maricopa County, AZ) |