| Acronym | Definition |
|---|
| FOSA | Friends of South Asia |
| FOSA | Farook College Old Students Association (India) |
| FOSA | Forestal Oriental SA (Uruguay) |
| FOSA | Friends of St. Andrews (UK) |
| FOSA | Friends of the School Association (UK) |
| FOSA | Forskrift Om Forsvars- og Sikkerhetsanskaffelser (Norwegian: Regulations about Defence and Security Procurement) |
| FOSA | Formula One Supporters Association (UK) |
| FOSA | Facts, Objectives, Solutions, Actions (business philosophy) |
| FOSA | Federation Of Spine Associations |
| FOSA | Front Office Service Activities |
| FOSA | Flight Operations Support Annex |
| FOSA | Federal Operational Staging Area |
| FOSA | Field Office System Administrator (Capstone Corporation) |
| FOSA | Five O'clock Shadow Apparel (New York, NY) |
| FOSA | Friends of the Office of State Archaeology, Inc (Connecticut) |