| Abbreviation | Definition |
|---|---|
| NSBE | National Society of Black Engineers |
| NSBP | National Society of Black Physicists |
| NSBP | National Spina Bifida Program |
| NSCC | National Sports Concussion Coalition |
| NSCC | Naval Sea Cadet Corps |
| NSCD | National Sports Center for the Disabled |
| NSCF | National Scholastic Chess Foundation |
| NSCF | National Ski Council Federation |
| NSCF | Navy Supply Corps Foundation |
| NSCF | Nonprofit Space Capital Fund |
| NSCFI | Navy Supply Corps Foundation, Inc. |
| NSCI | National Smoking Cessation Institute |
| NSCIA | National Spinal Cord Injury Association |
| NSCIA | Nigeria Supreme Council for Islamic Affairs |
| NSDC | National Square Dance Convention |
| NSDC | National Staff Development Council |
| NSEF | National Social Entrepreneurship Forum |
| NSEF | Natoma Station Education Foundation |
| NSF | National Sanitation Foundation |
| NSF | National Schizophrenia Fellowship |