| HDN | Haemolytic Disease of Newborn
| Others |
| HDN | Hayden Airport, Steamboat Springs, Colorado USA
| Others |
| HDN | Health and Development Networks
| Others |
| HDN | Hedal Drive Number
| Others |
| HDN | Hemolytic Disease of Newborn
| Others |
| HDN | Hemolytic Disease of Newborns
| Others |
| HDN | Hemolytic disease of the newborn
| Others |
| HDN | Hemorrhagic Disease of Newborn
| Others |
| HDN | Henry Duke of Norfolk
| Others |
| HDN | Hierarchical Democracy of Nerds
| Others |
| HDN | High Definition Neo
| Others |
| HDN | Hispanic Digital Network
| Others |
| HDN | Home Delivery
| Others |
| HDN | Home Delivery Network
| Others |
| HDN | Homeland Defense Network
| Others |
| HDN | Hosting Deactivation Notice
| Others |
| HDN | Human Dependence on Nature
| Others |
| HDN | Human Development Network
| Others |
| HDN | Hygienic Design Network
| Others |
| HDN | Hypotheken Data Netwerk
| Others |