HNO
| Acronym | Definition |
|---|---|
| HNO | Hals-Nasen-Ohren Heilkunde (German: throat, nose and ear medicine) |
| HNO | Hals Nasen Ohrenheilkunde |
| HNO | Host Network Operator |
| HNO | Harvard News Office |
| HNO | Helvetica Narrow Oblique (font) |
| HNO | Hungarian National Observatory |
| HNO | Houston-New Orleans, Inc. (Houston, TX) |