| Acronym | Definition |
|---|
| ONP | Optical Network Planner |
| ONP | Open Network Processor |
| ONP | Open Network Provision |
| ONP | Overlay Network Provider |
| ONP | Olympic National Park |
| ONP | Open Network Provision(ing) |
| ONP | Old Newspapers (pulp and paper inustry) |
| ONP | Office of Nuclear Physics (US Department of Energy) |
| ONP | Omega Natural Polarity (India) |
| ONP | One Nation Party |
| ONP | Operation Na Pali (gaming) |
| ONP | Omron Network Products (Pleasanton, CA) |
| ONP | Old National Pike (various locations) |
| ONP | Orthotics and Prosthetics |
| ONP | One Night Process |
| ONP | Office National des Postes du Mali (National Post Office of Mali) |
| ONP | Organized Noize Productions, Inc. |
| ONP | Optical Network Protector (Delaire) |