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