| Acronym | Definition |
|---|
| HDH➣High Density Housing (various organizations) |
| HDH➣Hotel Dieu Hospital (Ontario, Canada) |
| HDH➣Henrico Doctors' Hospital (Richmond, VA) |
| HDH➣Holland Dozier Holland |
| HDH➣Dillingham Airfield (north shore of Oahu near the community of Waialua) |
| HDH➣Herrera, Davis, Holland (bullpen pitchers; Kansas City Royals; Kansas City, MO) |
| HDH➣HDLC Distant Host |
| HDH➣Humidification-Dehumidification (desalination method) |
| HDH➣Hawaii Department of Health |
| HDH➣High Dollar Hooker |
| HDH➣Harper Dennis Hobbs (UK) |
| HDH➣His Divine Holiness |
| HDH➣Harry & David Holdings (Medford, OR) |
| HDH➣Home Dear Home |