HDN
Appearance
HDN may refer to
Medicine
[edit]- Hemolytic disease of the newborn, an alloimmune illness
- Hydronephrosis, hydrostatic dilation of the kidney
Places
[edit]- Harlesden station, England, station code
- Yampa Valley Airport, Colorado, US, IATA code
Other
[edit]- Hyperdimension Neptunia, a video game series
- Hydrodenitrogenation, an industrial chemical process
- Northern Haida language of North America, ISO 639-3 code
- Philippine Human Development Network
- Hdn., an abbreviation for the Greek grammarian Aelius Herodianus