| Acronym | Definition |
|---|
| SSMO➣Sisters of St. Mary of Oregon (religious order) |
| SSMO➣Sudanese Standards and Metrology Organization |
| SSMO➣Summary of Synoptic Meteorological Observations |
| SSMO➣Ship Safety Management Office (UK) |
| SSMO➣State Surface Maintenance Office |
| SSMO➣Sewer System Maintenance and Operation Department (Northeast Ohio Regional Sewer District; Cleveland, OH) |