| 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) |