| SSMO | Sakartvelos Skauturi Modzraobis Organizatsia 
| Others |
| SSMO | Servicio de Salud Metropolitano Oriente
| Others |
| SSMO | Shetland Shellfish Management Organisation
| Others |
| SSMO | Sisters of St Mary of Oregon
| Others |
| SSMO | Soldier Systems Management Office
| Others |
| SSMO | Space Science Mission Operations
| Others |
| SSMO | State Service Management Office
| Others |
| SSMO | Subsistence Supply Management Office
| Others |
| SSMO | Sudanese Standard Metrology Organization
| Others |
| SSMO | Sudanese Standards and Metrology Organization
| Others |
| SSMO | Supply and Services Management Officer
| Others |
| SSMO | Supply Subsistence Management Office
| Others |
| SSMO | Swiss Society of Medical Oncology
| Others |