| Acronym | Definition |
|---|
| RMSA | Rastriya Madhyamik Shiksha Abhiyan (Indian initiative) |
| RMSA | Relevant Metropolitan Statistical Area |
| RMSA | Rocky Mountain Spearfishing Association |
| RMSA | Rocky Mountain Society of Aviculture |
| RMSA | Retiree Medical Savings Account |
| RMSA | RMSU (Russian State Medical University) Malaysian Students Association |
| RMSA | Retail Merchandising Service Automation |
| RMSA | Rocky Mountain Scottish Athletes |
| RMSA | Rocky Mountain Soaring Association |
| RMSA | Rural Music Schools Association (now Benslow Music Trust; UK) |
| RMSA | Registered Member of the Society of Archivists (UK) |
| RMSA | Rectangular Microstrip Antenna |
| RMSA | Research Management Self Assessment |
| RMSA | Seaman Apprentice, Radioman Striker (Naval Rating) |
| RMSA | Roof Manufacturers & Suppliers Association (Ireland) |
| RMSA | Radiological Material Storage Area |