| Abbreviation | Definition |
|---|---|
| NBT | Neutral Buoyancy Trainer |
| NBT | New Boost Technique |
| NC | National Coarse |
| NC | No Change |
| NC | No Comment |
| NC | Normal Corrective maneuver |
| NC | Normally Closed |
| NC | Numerical Control |
| NC1 | Nominal Correction 1 |
| NCA | North Central Association |
| NCAM | National Center for Advanced Manufacturing |
| NCAS | NASA CC Aerospace Scholars |
| NCC | NASA Class Code |
| NCC | Nominal Corrective Combination (maneuver) |
| NCCS | NASA Center for Computational Sciences |
| NCFI | North Carolina Foam Insulation |
| NCGS | Nuclear Criteria Group Secretary |
| NCIU | Network Common Interface Unit |
| NCMR | National Center for Microgravity Research |
| NCOS | National Commission on Space |