| Acronym | Definition |
|---|
| MASI➣Melasma Area and Severity Index (dermatology) |
| MASI➣Manhattan Sites (US National Park Service) |
| MASI➣Metropolitan Andrey Sheptytsky Institute (Saint Paul University; Ottawa, Canada) |
| MASI➣Major Acquisition Systems Infrastructure (US Coast Guard) |
| MASI➣Mach Airspeed Indicator |
| MASI➣Multithreaded Architecture for Software I/O |
| MASI➣ManTech Advanced Systems International, Inc. (Glen Burnie, MD) |
| MASI➣Member of the Architectural and Surveying Institute |