| Acronym | Definition |
|---|
| BSSO➣British Services Security Organisation (UK) |
| BSSO➣British Scooter Sport Organisation (UK) |
| BSSO➣Building Science Specialist of Ontario (Ontario Building Envelope Council; Canada) |
| BSSO➣Big Sounds Society Orchestra (Japan) |
| BSSO➣Birmingham Schools Symphony Orchestra (Birmingham, England, UK) |
| BSSO➣Bilateral Sagittal Split Osteotomy |