| Acronym | Definition |
|---|
| UMSA➣Universidad Mayor de San Andrés (La Paz, Bolivia) |
| UMSA➣Universities at Medway Students' Association (UK) |
| UMSA➣United Muslim Students Association |
| UMSA➣Udruzenje Muslimana Sjeverne Amerike (Serbian: Society of Bosnian Muslims of North America) |
| UMSA➣Unincorporated Municipal Service Area |
| UMSA➣Unreimbursed Medical Spending Account |
| UMSA➣University Medical Services Association (Wright State University School of Medicine; Dayton, OH, USA) |
| UMSA➣United Mini Sprint Association |
| UMSA➣Unincorporated Metropolitan Services Area |
| UMSA➣Upper Midwest Security Alliance |
| UMSA➣Unity Movement of South Africa |
| UMSA➣Unionville Minor Softball Association (Ontario, Canada) |
| UMSA➣Universal Metallurgical Simulator and Analyzer |
| UMSA➣Undergraduate Modeling, Simulation, and Analysis (course) |
| UMSA➣Union of Malaysian Students in Auckland (New Zealand) |
| UMSA➣Undergraduate Mathematics Students Association |
| UMSA➣University of Manchester Staff Association (UK) |
| UMSA➣United Methodist Student Association |
| UMSA➣Ultrasound Manufacturers and Suppliers Association |
| UMSA➣Uniform Money Services Act of 2000 (US) |
| UMSA➣United Minority Students Association |
| UMSA➣United Mobile Sportfishermen Association |
| UMSA➣United Marine Suppliers Association, LLC (Springfield, MO) |
| UMSA➣Usiminas Mecânica SA (Brazilian steel company) |
| UMSA➣Universal Mating Service America |