| Acronym | Definition |
|---|
| ARCH | Architecture |
| ARCH | Arches National Park (US National Park Service) |
| ARCH | Archery |
| ARCH | Archbishop |
| ARCH | Archaic |
| ARCH | Autoregressive Conditional Heteroskedasticity |
| ARCH | Advocacy Resource Centre for the Handicapped |
| ARCH | Association of Registered Clinical Hypnotherapists |
| ARCH | Adult Residential Care Home |
| ARCH | Animal Rights Collective of Halifax (Canada) |
| ARCH | Auto Rétro Club Herblaysien (French vintage car club) |
| ARCH | Access Response Channel |
| ARCH | Air Rotary Casing Hammer |
| ARCH | Association for Radio Controlled Helicopters |
| ARCH | Air Rescue Consortium of Hospitals (air medical services company) |
| ARCH | ARgonne CHicago (ARCH Development Corp.) |
| ARCH | Advanced Reconnaissance Compression Hardware |
| ARCH | Advocates for Reproductive Choice in Healthcare |
| ARCH | Automatic Remote Cassette Handler |
| ARCH | Action Research and Community Health and Development |
| ARCH | Air Forces' Regional Communications Hub |