| Abbreviation | Definition |
|---|---|
| SMO | Social Media Optimisation |
| SMOB | Swiss Study Group for Morbid Obesity |
| SMP | Senior Medicare Patrol |
| SMP | Synchronous Membership Program |
| SMPS | Society for Marketing Professional Services |
| SMR | Sutherland Medieval Regiment |
| SMRFA | Sierra Madre Rose Float Association |
| SMRH | Secretaria Municipal De Recursos Humanos |
| SMSA | Seabee Memorial Scholarship Association |
| SMSA | St. Meryl School Association |
| SMURF | Single Mothers United in Rewarding Fellowship |
| SMW | Society of Military Widows |
| SMWA | Southwest Montana Wildlands Alliance |
| SMYAL | Sexually Minority Youth Assistance League |
| SNAC | Scottish Network for Arthritis in Children |
| SNAC | Seattle Nutrition Action Consortium |
| SNAC | Senior Nutrition Action Council |
| SNAC | Statewide Native American Coalition |
| SNAF | Special Needs Adoption Fund |
| SNAFS | Special Needs Assistance For Seniors |