| Acronym | Definition |
|---|
| HN | Horn (French Horn; Music) |
| HN | Honduras (country code, top level domain) |
| HN | Hacker News |
| HN | Honorable |
| HN | Hunan (China) |
| HN | Human Nature |
| HN | Hainan (China) |
| HN | Human Nutrition (various schools) |
| HN | Hawk Nelson (band) |
| HN | Hallands Nyheter (Swedish newspaper) |
| HN | Nitrogen Mustard (blister chemical agent) |
| HN | Hospital Nacional |
| HN | Hellenic Navy (Greece) |
| HN | Headline News |
| HN | Head Nurse |
| HN | Healthnet |
| HN | Host Nation |
| HN | Home Networking |
| HN | Home Net |
| HN | Hungarian Notation (identifier naming convention) |
| HN | Hull Number (ship) |
| HN | Health Nut |
| HN | Hospitalman (USN Rating) |
| HN | Hahnium (IUPAC element 108) |
| HN | Hardware Node (computing) |
| HN | Household Notes |
| HN | Hell No |
| HN | Hardware & Networking (education program; Karnataka State Open University; India) |
| HN | Heartland Network (Minneapolis, MN) |
| HN | Hardin Northern |
| HN | Hutchinson and Northern Railway Company |
| HN | Hydrodynamical Numerical (Model) |
| HN | Headquarters Notice |
| HN | Hospital Novicentro (Guatemala) |