| 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) |