| Acronym | Definition |
|---|
| ISTM➣It Seems To Me |
| ISTM➣International Society of Travel Medicine |
| ISTM➣Irish Society of Travel Medicine |
| ISTM➣International Society for Testing Materials |
| ISTM➣International School of Tactical Medicine (Palm Springs, CA) |
| ISTM➣International Semi Tech Microelectronics, Inx (defunct Canadian holding company) |