| H&N | Head and Neck 
| Others |
| H&N | Hoffmann and Novague
| Others |
| H/N | Hot or Not
| Others |
| H@N | Hospital at Night
| Others |
| HN | Ha Noi
| Others |
| HN | Habibi Net
| Others |
| HN | Habibo Net
| Others |
| HN | Hacker and
| Others |
| HN | Haemagglutinin Neuraminidase
| Others |
| HN | Haemorrhage of Newborn
| Others |
| HN | Half Note
| Others |
| HN | Handler Number
| Others |
| HN | Hanoi
| Others |
| HN | Hardware Networking
| Others |
| HN | Harold Nestler
| Others |
| HN | Harry Nixon
| Others |
| HN | Harry Norman
| Others |
| HN | Harvard Nebula
| Others |
| HN | Haus Nummer
| Others |
| HN | Hava Nagila
| Others |
| Hn | Haven
| Others |
| HN | Head Nurse
| Others |
| HN | Health Nurse
| Others |
| HN | Heavy Nu
| Others |
| HN | Hell No
| Others |
| HN | Hemagglutinin Neuraminidase
| Others |
| HN | Hemligt Nummer
| Others |
| HN | Hereditary Nephritis
| Others |
| HN | Hereditary Nephropathy
| Others |
| HN | Heure Normale
| Others |
| HN | High Needs
| Others |
| HN | High Nit (luminosity)
| Others |
| HN | High Nitrogen
| Others |
| HN | Histoires Naturelles
| Others |
| HN | Holding Nothing
| Others |
| HN | Home Navigation
| Others |
| HN | Home Networking
| Others |
| HN | Home Number
| Others |
| HN | Homonym Number
| Others |
| HN | Hong Nu
| Others |
| HN | Honolulu Field Office
| Others |
| HN | Hook Norton
| Others |
| HN | Hospitalman
| Others |
| HN | Host Name
| Others |
| HN | Host Nation
| Others |
| HN | Hot Neighbor
| Others |
| HN | Hotel Name
| Others |
| HN | Hutchinson and Northern Railway
| Others |
| HN | Hutchinson and Northern Railway Company
| Others |
| HN | Hypothetically Necessary
| Others |