| Abbreviation | Definition |
|---|---|
| NKF | National Karate-do Federation |
| NKI | National Karate Institute |
| NKN | National Kart News |
| NKN | NeoKarate Network |
| NL | National League |
| NLB | National League Baseball |
| NLBA | New Lenox Baseball Association |
| NLCS | National League Championship Series |
| NLCSMVP | National League Championship Series Most Valuable Player |
| NLDS | National League Division Series |
| NLL | National Lacrosse League |
| NLP | New Long Putter |
| NLSF | Next Level Sports Foundation |
| NLWC | National League Wild Card |
| NM | National Match |
| NMBHA | New Mexico Bowhunters Association |
| NMC | NUKF (National Union of Karate-Do Federation) Media Cell |
| NMG | Net Match Game |
| NMST | Nishimura Mazda Sports Tuning |
| NMT | Nitro Monster Truck |