| Abbreviation | Definition |
|---|---|
| NSI | Natural Selection Invitational |
| NSJ | Numbered Sports Jerseys |
| NSK | National Sporting Library |
| NSL | Nashville Sports Leagues |
| NSL | National Sim League |
| NSL | National Ski League |
| NSL | National Skydiving League |
| NSL | National Soccer League |
| NSL | National Sporting Library |
| NSN | Northeast Sports Network |
| NSO | No Sell Out |
| NSP | Not Sufficient Players |
| NSQ | New Salmon Queen |
| NSQ | Not Show Quality |
| NSR | National Scouting Report |
| NSR | National Sports Roundtable |
| NSR | No Such Rule |
| NSR | Northwest Sportbike Riders |
| NSRA | National Stunt Riding Association |
| NSSA | North Side Sportsmen's Association |