MTSI
| Acronym | Definition |
|---|---|
| MTSI | Modern Technology Solutions, Inc. (various locations) |
| MTSI | Micro Technology Services, Inc. (Richardson, TX) |
| MTSI | Microwave Transmission Systems, Inc. (Richardson, TX; est. 1987) |
| MTSI | Modern Technology Systems, Inc. |
| MTSI | Macular Translocation with Scleral Infolding (ophthalmology) |
| MTSI | Member of the Trading Standards Institute |
| MTSI | Master Translating Services, Inc (Miami, FL) |