- ACHA stands for American Collegiate Hockey Association
- ACHA stands for American College Health Association
- ACHA stands for American College of Healthcare Architects
- ACHA stands for Agency for Healthcare Administration (Florida)
- ACHA stands for Aboriginal Cultural Heritage Act (Australia)
- ACHA stands for Association for Communal Harmony in Asia
- ACHA stands for Applied and Computational Harmonic Analysis (mathematical journal)
- ACHA stands for American Catholic Historical Association (Washington, DC)
- ACHA stands for Air-Conduction Hearing Aid (device)
- ACHA stands for Allegheny County Housing Authority (Pittsburgh, PA)
- ACHA stands for American College of Hospital Administrators
- ACHA stands for African Canadian Heritage Association (Toronto, Ontario, Canada)
- ACHA stands for Australian Community Health Association
- ACHA stands for Adelaide Community Health Alliance (Australia)
- ACHA stands for Associate Commissioner for Health Affairs
ACHA