- ACTR stands for Actuator
- ACTR stands for American Council of Teachers of Russian
- ACT-R stands for Adaptive Control of Thought-Rational (cognitive theory)
- ACTR stands for Association for Canadian Theatre Research
- ACTR stands for A Christmas To Remember
- ACTR stands for American Consulting Technology and Research (Provo, UT)
- ACT-R stands for Adaptive Character of Thought- Rational
- ACTR
- ACTR stands for Acquired Commercial Technology for Retrieval
- ACTR stands for Acquisition Cycle Time Reduction
- ACT-R stands for Air Combat Training – Rangeless (Cubic Defense Systems)
ACT-R