- ACGS stands for American-Canadian Genealogical Society
- ACGS stands for Anglican Church Grammar School
- ACGS stands for Assistant Chief of the General Staff (British Army position)
- ACGS stands for A Chinese Ghost Story (film)
- ACGS stands for Ashtabula County Genealogical Society, Inc.
- ACGS stands for Aerospace Cartographic and Geodetic Service (US Air Force; now defunct)
ACGS