- YCAS stands for Yamaha Commercial Audio Systems, Inc.
- YCAS stands for York County Astronomical Society (Pennsylvania)
- YCAS stands for Yemen Center for Arab Studies
- YCAS stands for Yolo County Animal Services (shelter; Woodland, CA)
- YCAS stands for York Center for Applied Sustainability (Toronto, Ontario, Canada)
- YCAS stands for York Community Accounting Scheme (UK)
YCAS