| Acronym | Definition |
|---|
| ACTM➣Atmospheric Chemistry Transport Model |
| ACTM➣Arkansas Council of Teachers of Mathematics |
| ACTM➣Auto, Commercial, Trailer, Motorcycle (California Department of Motor Vehicles) |
| ACTM➣Association of Certified Treasury Managers (est. 1998; India) |
| ACTM➣Atlantic College of Therapeutic Massage (Fredericton, NB, Canada) |
| ACTM➣Australian College of Tropical Medicine |
| ACTM➣Aircraft Collection Tasking Message |