| Abbreviation | Definition |
|---|---|
| GYD | Global Youth Development |
| GYDO | Global Youth Development Organisation |
| HAAD | Horn of Africa Action for Development |
| HADA | Hyderabad Airport Development Authority |
| HADC | Hartford Area Development Corportation |
| HADC | Hough Area Development Corp |
| HADG | Health and Administration Development Group |
| HADG | High Alpha Development Group |
| HADG | Human Asset Development Group |
| HADI | Human Assistance Development International |
| HADK | Hardware Adaptation Development Kit |
| HADP | Haiti Agricultural Development Project |
| HADP | Hill Area Development Programme |
| HADP | Hill Areas Development Programme |
| HADT | Huronia Alpine Development Team |
| HAGD | Harvard Alumni for Global Development |
| HAMT | Health Area Management Team |
| HANDS | Hands Along the Nile Development Services |
| HANDS | Health Access Nurturing Development Services |
| HANNN | Healthy Ageing Network Northern Netherlands |