| Acronym | Definition |
|---|
| MSSF➣Mycological Society of San Francisco |
| MSSF➣Multi Service Switching Forum |
| MSSF➣Massachusetts State Science Fair, Inc. (Sandwich, MA) |
| MSSF➣Market Square Steeple Fund (church preservation; Portsmouth, NH) |
| MSSF➣Mercury Special Situations Fund |
| MSSF➣Macrophage Stimulated Soluble Factor (pathology) |