HHAS
| Acronym | Definition |
|---|---|
| HHAS | Hi-Hat Appreciation Society (Europe) |
| HHAS | Hertfordshire Hearing Advisory Service (UK) |
| HHAS | Humane Haven Animal Shelter (Bolingbrook, IL) |
| HHAS | Historic Houses Association for Scotland (Edinburgh, Scotland, UK) |
| HHAS | Hypothalamo-Hypophyseal-Adrenal System |
| HHAS | Hypothalamo-Hypophyseal-Adrenocortical System |
| HHAS | Hypothalamo-Hypophyseal Antidiuretic System |