HHN
| 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) |