| Acronym | Definition |
|---|
| ORN➣Osteoradionecrosis |
| ORN➣Omnibusverkehr Rhein-Nahe GmbH (German regional public transport) |
| ORN➣Offshoring Research Network (North Carolina) |
| ORN➣Olympic Route Network (UK) |
| ORN➣Onion Radio News |
| ORN➣Operation Rescue National |
| ORN➣Oran, Algeria - Es Senia (Airport Code) |
| ORN➣Ohio Resource Network (substance abuse) |
| ORN➣Outdoor Recreation Network |
| ORN➣Obligatory Running Note |
| ORN➣Ophthalmic Research Network |
| ORN➣Online Racing Network |
| ORN➣Original Nutters (gaming clan) |
| ORN➣Oval Racing News |