| Acronym | Definition |
|---|
| HHN➣Halloween Horror Nights (Universal Studios; California and Florida) |
| HHN➣Heavy Hex Nut (fastener) |
| HHN➣Hospitals & Health Networks |
| HHN➣Healing Heroes Network (Florida) |
| HHN➣Hand Held Nebulizer |
| HHN➣Human Help Network (Mainz, Germany) |
| HHN➣Hockey Heritage North (conference center; Canada) |
| HHN➣Hell and Heaven Net (gaming fansite) |
| HHN➣Help Haiti Now (Venice, FL) |