| Acronym | Definition |
|---|
| CHAT | Checklist for Autism in Toddlers |
| CHAT | Choline Acetyltransferase |
| CHAT | Conversational Hypertext Access Technology |
| CHAT | Cat Hospital at Towson (Baltimore, MD) |
| CHAT | Chattahoochee River National Recreation Area (US National Park Service) |
| CHAT | Conversational Hypertext Access Technology (Communications Canada) |
| CHAT | Chicago Harmony and Truth (Chicago, IL) |
| CHAT | Citizens for Humane Animal Treatment |
| CHAT | Criminal History Access Tool (state of Michigan) |
| CHAT | Chemically Hardened Air Transportable Hospital |
| CHAT | Commercial Helicopter Advisory Team |
| CHAT | Chemicals, Heat, Agitation, Time (soil suspension cleaning) |