| Acronym | Definition |
|---|
| NSN | National Stock Number |
| NSN | Nokia Siemens Networks |
| NSN | NATO Stock Number |
| NSN | National Storytelling Network |
| NSN | New Schools Network (UK) |
| NSN | Night Sky Network (various organizations) |
| NSN | New Substances Notification (CEPA) |
| NSN | National Service Network (UK) |
| NSN | National Student Number (NZ) |
| NSN | Never Shout Never (band) |
| NSN | Never Say Never |
| NSN | No Shave November |
| NSN | National Support Network |
| NSN | Native Sovereign Nation |
| NSN | No Stigma Network (peer support) |
| NSN | Nelson, New Zealand - Nelson (Airport Code) |
| NSN | No Serial Number |
| NSN | No Such Number |
| NSN | National Seismic Network (earthquake monitoring; various nations) |
| NSN | Noskillsneeded (gaming clan) |
| NSN | NASA Space Network |
| NSN | National Supervisory Network |
| NSN | National Screening Nursery |
| NSN | National Sleep Network |
| NSN | Northern Sportsman's Network |
| NSN | Network Service Number (telecommunications) |
| NSN | No Soap Needed |
| NSN | Non Special Need (adoptions) |