| Acronym | Definition |
|---|
| ONN | Ohio News Network |
| ONN | Onion News Network (satirical news website) |
| ONN | Optical Network Node |
| ONN | Open Network Nodes |
| ONN | Oficina Nacional de Normalización (Spanish: National Bureau of Standards; Cuba) |
| ONN | Ontario Nonprofit Network (Canada) |
| ONN | Online Noetic Network |
| ONN | Olympic Nice Natation (French: Nice Olympic Swimming; Nice, France) |
| ONN | Oncology Nursing News (online magazine) |
| ONN | Open News Network (online resource) |
| ONN | Open Network Node |
| ONN | Optometry News Network (est. 2007) |
| ONN | Optical Neural Network (computer science) |
| ONN | Ontario Network of Needleworkers (est. 1983; Canada) |
| ONN | Organization of Nigerian Nationals (Dallas, TX) |
| ONN | Object Navigation Notation |
| ONN | Online Nigerian News (online magazine) |
| ONN | Opportunity News Network (website) |