| 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 |