- AACH stands for Arlington Alexandria Coalition for the Homeless (est. 1985; Arlington, VA)
- AACH stands for American Academy on Communication in Healthcare
- AACH stands for Asian American Church of Houston (Houston, TX)
- AACH stands for Atlanta Advanced Communications Holdings Limited (Marietta, GA)
- AACH stands for American Academy of Clinical Homeopathy (Conyers, GA)
- AACH stands for Atypical Alveolar Cell Hyperplasia
AACH