| Abbreviation | Definition |
|---|---|
| HA3 | Laugh Out Loud |
| HACD | Hawaii Association of Conservation Districts |
| HAND | Have A Nice Day |
| HCCA | High Country Conservation Advocates |
| HCCB | Hancock County Conservation Board |
| HCD | Heritage Conservation District |
| HCD | Housing Conservation District |
| HCH | Habits Cure Habit |
| HCPAC | Habitat Conservation Plan Advisory Committee (Florida) |
| HCRS | Heritage Conservation and Recreation Service |
| HCRS | Herring Conservation Research Society |
| HCV | High Conservation Value |
| HCVA | High Conservation Value Areas |
| HELC | Highly Erodible Land Conservation |
| HFGL | Have Fun, Good Luck |
| HFH | a Home From Home |
| HICAI | Harsens Island Conservation Association Inc |
| HKCD | Houghton Keweenaw Conservation District |
| HLCA | Heart Lake Conservation Area |
| HLCT | Hamden Land Conservation Trust |