| Acronym | Definition |
|---|
| ATSM | At The Same Time |
| ATSM | Acute Traumatic Stress Management |
| ATSM | Advanced Terminal Session Management (Stay-Linked) |
| ATSM | Association Tunisienne des Sciences Mathématiques (French: Tunisian Association of Mathematical Sciences; Tunisia) |
| ATSM | Athletic Training/Sports Medicine (academic program; various locations) |
| ATSM | Area Technical Support Manager |
| ATSM | Ateliers de Tolerie et de Serrurerie de Montreuil (French: Body Shop and Locksmith Montreuil; Montreuil, France) |
| ATSM | Automatic Threshold Selection Method (radiology) |
| ATSM | Association des Techniciens Supérieurs du Mobilier (French: Furniture Technicians Association; est. 1990) |
| ATSM | Autorails Touristiques Seine et Marnais (French: Seine et Marne Tourist Railcars; Siene et Marne, France) |