CAHS may refer to:
- Canadian Aviation Historical Society
- Canadian Academy of Health Sciences, a national academy in Canada
- Carman-Ainsworth High School, a public school in Flint, Michigan
- The College of Allied Health Sciences at the University of Cincinnati
- Colorado Aviation Historical Society
- Classical Academy High School
- Columbus Alternative High School, a central Ohio public high school in the Columbus City School district
- Council of Australian Humanist Societies
Classical Academy High School, home of the Caiman
"Charlotte Amalie High School - St. Thomas, USVI"