| Acronym | Definition |
|---|
| HALS | Historic American Landscape Survey (American Society of Landscape Architects) |
| HALS | Hindered Amine Light Stabilizer (polymer coating) |
| HALS | Health and Activity Limitation Survey (Canada) |
| HALS | Houston Area Library System |
| HALS | Hand Assisted Laparoscopic Surgery |
| HALS | Hertfordshire Archives and Local Studies (UK) |
| HALS | Houston Area Live Steamers (Hockley, Texas) |
| HALS | HIV-Associated Lipodystrophy Syndrome |
| HALS | Hawaii Association of Land Surveyors |
| HALS | Higher, Adjacent, Lower, Supporting (part of constructive simulation exercises) |