| Acronym | Definition |
|---|
| GSSO➣Granite State Symphony Orchestra (Concord, NH) |
| GSSO➣Government Special Security Officer (Florida) |
| GSSO➣Gas Staffs and Senior Officers (British Gas; UK) |
| GSSO➣Government Secondary School Owerri (Imo State, Nigeria) |
| GSSO➣General Stores Supply Office |
| GSSO➣Government SAP (Special Access Program) Security Officer (US DoD) |
| GSSO➣Glasgow Schools' Symphony Orchestra (UK) |
| GSSO➣Global Shared Service Organisation |