MSSF
| 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) |