| Abbreviation | Definition |
|---|---|
| NCS | North Columbus Sports |
| NCSBL | Northeastern Conference Senior Basketball League |
| NCSC | Nepean City Soccer Club |
| NCSF | National Council on Strength and Fitness |
| NCSG | National Congress of State Games |
| NCW | New Championship Wrestling |
| NCW | Northside Championship Wrestling |
| ND | No Decision |
| ND | No Delay |
| ND | Not Dancing |
| NDA | Niagara Divers Association |
| NDA | Notre Dame Academy |
| NDBA | National Drag Boat Association |
| NDBA | Niagara District Baseball Association |
| NDBA | Niagara District Bridge Association |
| NDBA | North Delta Baseball Association |
| NDCA | National Debate Coaches Association |
| NDCA | Northern Districts Cricket Association |
| NDDC | Nissan Datsun Drivers Club |
| NDH | National Directory of High School Coaches |