- YACS stands for Yet Another Community System
- YACS stands for Young Adult Cancer Survivors (cancer-survivor social group)
- YACS stands for Yale Adherence and Competence Scale (behavioral research)
- YACS stands for Yet Another Curta Simulator (VRML Simulation of the Famous Curta Mechanical Calculator)
- YACS stands for You Are Correct, Sir
- YACS stands for Years of Active Commissioned Service
YACS