| FOSA | Formula One Supporters Association (UK) | 一级方程式赛车支持者协会（英国） |
| FOSA | Federation Of Spine Associations | 脊柱协会联合会 |
| FOSA | Federal Operational Staging Area | 联邦作战暂存区 |
| FOSA | Friends Of The Sick Association | 病友会 |
| FOSA | Friends of the Office of State Archaeology, Inc (Connecticut) | 州考古办公室之友（康涅狄格州） |
| FOSA | Friends of South Asia | 南亚之友 |
| FOSA | Front Office Service Activities | 前台服务活动 |
| FOSA | Flight Operations Support Annex | 飞行操作支持附件 |