| BSSO | Ball State Symphony Orchestra 
| Others |
| BSSO | Belgian Society for Surgical Oncology
| Others |
| BSSO | Belgian Society of Surgical Oncology
| Others |
| BSSO | Bilateral Saggital Split Osteotomy
| Others |
| BSSO | Bilateral Saggital Split Osteotomy (jaw surgery)
| Others |
| BSSO | Bilateral Sagittal Splint Osteotomy
| Others |
| BSSO | Bilateral Sagittal Split Osteotomy
| Others |
| BSSO | Bilingual School Services Officers
| Others |
| BSSO | Biomedical Sciences Student Organization
| Others |
| BSSO | Block Social Security Officer
| Others |
| BSSO | Brazilian Society of Surgical Oncology
| Others |
| BSSO | British Scooter Sport Organisation
| Others |
| BSSO | British Services Security Organisation
| Others |
| BSSO | Building Science Specialist of Ontario
| Others |
| BSSO | Business Systems Support Office
| Others |