ISTM
| 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) |