| Acronym | Definition |
|---|
| FSSO➣Fame Single Sign on |
| FSSO➣Free State Symphony Orchestra (South Africa) |
| FSSO➣Federated Single Sign-On |
| FSSO➣Flag Ship Service Organization (Scientology) |
| FSSO➣Fire Support Station Operator |
| FSSO➣Foreign Service Staff Officer |
| FSSO➣Flight Standards Satellite Office |