| Abbreviation | Definition |
|---|---|
| NDO | Nottinghamshire Darts Organisation |
| NDR | No Damn Rules |
| NDRL | National Dirt Racing League |
| NDS | Nike Distance Series |
| NDSA | Naperville Diamonds Softball Association |
| NDSA | North Dakota Softball Association |
| NDSQ | North Dakota SQuash team |
| NDSSA | North Dakota Shooting Sports Association |
| NDT | National Debate Tournament |
| NDW | New Dimension Wrestling |
| NE | Not Eligible |
| NEAC | North Eastern Athletic Conference |
| NEAS | New England Action Sports |
| NEBR | New England Basketball Recruiting |
| NECN | New England Channel Network |
| NED | Network of Egghead Divers |
| NED | New England Dragway |
| NEDB | New England Dirtbikes |
| NEER | New Experimental Experience Rating |
| NERA | Namibia Endurance Ride Association |