HDJ
| Acronym | Definition |
|---|---|
| HDJ | Heimattreue Deutsche Jugend (German: Home Faithful German Youth; youth political party) |
| HDJ | Hospitalisation de Jour (French: Day Hospital; outpatient hospital facilities) |
| HDJ | Homeland Defense Journal |
| HDJ | Haus des Jugendrotkreuzes (German: House of Red Cross Youth; Germany) |
| HDJ | Hydrographic Department of Japan |