NSSD
| Acronym | Definition |
|---|---|
| NSSD | National Strategies for Sustainable Development |
| NSSD | Normalized Sum Squared Difference |
| NSSD | National Security Study Directive |
| NSSD | National Sun Safety Day (National Council on Skin Cancer Prevention) |
| NSSD | National Survivors of Suicide Day (American Foundation for Suicide Prevention) |
| NSSD | National Security Strategy Document |
| NSSD | Nuclear Safety Services Department |