MSII
| Acronym | Definition |
|---|---|
| MSII | Media Sciences International, Inc. (Oakland, NJ) |
| MSII | Multi Services Informatique & Ingénierie (French: Multi Services Computer & Engineering) |
| MSII | Second Year Medical Student |
| MSII | Milestone II |
| MSII | Martial Science Institute International (martial arts) |
| MSII | Multiple Subcutaneous Insulin Injection (endocrinology) |
| MSII | Manitoba Sheep Industry Initiative (Manitoba Sheep Association Inc.; Canada) |