| Abbreviation | Definition |
|---|---|
| HAWA | Haywood Animal Welfare Association |
| HAWO | Honorary Animal Welfare Officer |
| HAWT | Hull Animal Welfare Trust |
| HBCA | Human Behaviour Change for Animals |
| HCAC | Harris County Animal Control |
| HCAL | Hill Country Animal League |
| HEAL | Human Earth And Animal Liberation |
| HEART | Help Every Animal Restore Trust |
| HEART | Humane Enforcement And Animal Rescue Team |
| HEART | Humane Evacuation Animal Rescue Team |
| HELG | Headwaters Equine Leadership Group |
| HFAA | Holstein-Friesian Association of America |
| HHAF | Happy Hills Animal Foundation |
| HHAF | Healing Haven Animal Foundation |
| HHAS | Humane Haven Animal Shelter |
| HHFA | Helping Hands For Animals |
| HKRAS | Hong Kong Reptile Amphibian Society (interest and education organization) |
| HMAH | Hume and Melrose Animal Hospital |
| HMAP | History of Marine Animal Populations |
| HMLE | Herd Mange/Lice Elimination (animal health) |