| Acronym | Definition |
|---|
| HARS | Hamilton Anxiety Rating Scale (psychology) |
| HARS | Human Assisted Robots |
| HARS | Historic Area Remediation Site |
| HARS | HIV/AIDS Reporting System |
| HARS | Housing and Residential Services (various organizations) |
| HARS | Historical Aircraft Restoration Society |
| HARS | Highway Advisory Radio System (public service announcements) |
| HARS | Heavy Attack Reconnaissance Squadron (US Army) |
| HARS | Hereford Amateur Radio Society (UK) |
| HARS | High Altitude Route System |
| HARS | Heading Attitude Reference Set |
| HARS | Heading & Altitude Reference System |
| HARS | Happy As Raw Sewage (punk magazine) |