English abbreviations from act to acts
- ACT (Adaptive Control of Thought (cognitive model))
- ACTA (Administrative Council for Terminal Attachment)
- ACTD (Advanced Concept Technology Demonstration)
- ACTE (Advanced Career Transition Education)
- ACTF ((U.S.) Army Constructive Training Federation)
- ACTFAST (Advanced Concepts and Technology Frequency Agile Solid-State Tuner)
- Actg (Acting)
- ACTH deficiency (Adrenocorticotropic hormone deficiency)
- ACTI (Advanced Computational Technology Initiative)
- ACTID (Advanced Concepts Test Integration Directorate)
- ACTII (Advanced Concept and Technology II Program)
- ACTION (Advising Counseling Testing Involving Orienting And Networking)
- ACTJRU (Australian Capital Territory Junior Rugby Union)
- ACTL (A Child To Love)
- ACTM (Alabama Council of Teachers of Mathematics)
- ACTO (Action Officer)
- ACTOR (Aerial Close Target Observation Report)
- ACTRA (Atlantic Canada Trail Riding Association)
- ACTS (A Community Tutoring Successfully)