MMSI
| Acronym | Definition |
|---|---|
| MMSI | Merit Medical Systems, Inc. (est. 1987; South Jordan, UT) |
| MMSI | Maritime Mobile Service Identity |
| MMSI | Miniature Munitions/Store Interface |
| MMSI | Managing Microsoft School Infrastructures (book) |
| MMSI | Military Miniature Society of Illinois |
| MMSI | Military Membership Status Identifier |