- ACTI stands for Air Combat Tactics Instructor
- ACTI stands for Advanced Cleanup Technologies, Inc (Rancho Dominguez, CA)
- ACTI stands for Advanced Cell Technology Inc.
- ACTI stands for Advanced Computational Technology Initiative
- ACTI stands for Advisory Committee on Technology Innovation
- ACTI stands for Alfred C. Toepfer International GmbH (Germany)
- ACTI stands for Aircrew Coordination Training Instructor
ACTI