| Acronym | Definition |
|---|
| NAN | Not A Number |
| NAN | North American Network (various organizations) |
| NAN | News Agency of Nigeria (est. 1976) |
| NAN | National Action Network |
| NAN | Nishnawbe Aski Nation (Canada) |
| NAN | Naval Aviation News (US Navy) |
| NAN | Near-Me Area Network (computer networking) |
| NAN | National Academy of Neuropsychology |
| NAN | Neighborhood Area Network |
| NAN | National Attorney Network |
| NAN | National Academy of Needlearts |
| NAN | National Association of Nannies |
| NAN | National Association of Neighborhoods |
| NAN | Nantucket AIDS Network (Nantucket, MA) |
| NAN | National Area Network |
| NAN | Nadi, Fiji - International (Airport Code) |
| NAN | National Association of Nurses |
| NAN | Naval Afloat Network(s) |
| NAN | Navy After Next |
| NAN | Naval Air Navigation |