| Abbreviation | Definition |
|---|---|
| SNAP | Seniors Needing A Pet |
| SNCC | Student Non-violent Coordinating Committee |
| SND | Sisters of Notre Dame |
| SNDDEN | Sisters of Notre Dame de Namur |
| SNDNDP | Sisters of Notre Dame de Namur Development Program |
| SNE | Society for Nutrition Education |
| SNEH | Solid Nutrition Education Health |
| SNF | Special Needs Fund |
| SNFI | Shelter/Non Food Items |
| SNI | Seth Network International |
| SNI | Sports Nutrition International |
| SNLG | Scottish and Newcastle Lymphoma Group |
| SNPA | Shenandoah National Park Association |
| SNPJ | Slovenska Narodna Podporna Jednota (Slovene National Benefit Society) |
| SNTN | Special Needs Trust Network |
| SNW | Sustainable NorthWest |
| SOA | Society Of Actuaries |
| SOA | Superior Officers Association |
| SOAR | Save Our Agricultural Resources |
| SOAR | Save Our Avian Resources |