| Abbreviation | Definition |
|---|---|
| NAWGJ | National Association of Women's Gymnastic Judges |
| NAYS | National Alliance For Youth Sports |
| NAYYC | National Association of Yachtsmen and Yacht Clubs |
| NB | NetBall |
| NB | No Ball |
| NB | Non Blocking |
| NBA | National Basketball Association |
| NBA | National Bowling Association |
| NBA | No Betting Allowed |
| NBA | Noon Basketball Association |
| NBA | North Bay All-stars |
| NBAC | Newsmen Basketball Association of Cebu |
| NBAE | National Basketball Association Entertainment |
| NBB | Natural Born Baller |
| NBBA | National Beep Baseball Association |
| NBC | New Breed of Champions |
| NBC | No Body Contact |
| NBC | Notredame Booster Channel |
| NBDL | National Basketball Development League |
| NBFC | North Beach Football Club |