| Acronym | Definition |
|---|
| NSG | Nuclear Suppliers Group |
| NSG | Newborn Screening and Genetics (Association of Public Health Laboratories) |
| NSG | National School of Government (UK) |
| NSG | Never Say Good Bye (song) |
| NSG | National Security Group (Department of Justice, Canada) |
| NSG | Nippon Sheet Glass (Japan) |
| NSG | National Security Guards (India) |
| NSG | Naturschutzgebiet (German: Nature Reserve) |
| NSG | Network Services Group (various locations) |
| NSG | No Sleep Gang (rap group) |
| NSG | Neurosurgeon |
| NSG | Network Services Gateway (various companies) |
| NSG | Naval Security Group |
| NSG | National System for Geospatial-Intelligence |
| NSG | National Stakeholder Group |
| NSG | Northbridge Services Group (Lexington, kY) |
| NSG | Network Support Group |
| NSG | National Steering Group (UK) |
| NSG | National Senior Games |
| NSG | National Support Group |
| NSG | National Seminars Group |
| NSG | Nacho Speed Garage (Honda) |
| NSG | New Socialist Group (Canada) |
| NSG | Node Steering Group |
| NSG | No Sphere Grid (gaming) |
| NSG | N-Substituted Glycine |
| NSG | Nelson Speleo Group (caving club in New Zealand) |
| NSG | Naui Services Group, Inc |
| NSG | Never Stop Grinding |
| NSG | Network Sub-Group |
| NSG | Notice Support Group |