| Abbreviation | Definition |
|---|---|
| NCSBL | Northeastern Conference Senior Basketball League |
| NEBL | North European Basketball League |
| NEBR | New England Basketball Recruiting |
| NESB | New England Spartan Basketball |
| NGBA | National Gay Basketball Association |
| NGBL | Northside Girls Basketball League |
| NHEB | North Hills Elementary Basketball |
| NIBT | National Indigenous Basketball Tournament |
| NITP | National Intensive Training Program (Basketball South Australia) |
| NJB | National Junior Basketball |
| NLBA | Newfoundland and Labrador Basketball Association |
| NLBA | Newfoundland Labrador Basketball Association |
| NLBA | North Langley Basketball Association |
| NLBA | Northern Lights Basketball Academy |
| NMB | National Men's Basketball |
| NMBA | Northside Minor Basketball Association |
| NMBC | New Mexico Basketball Club |
| NOBL | National Outdoor Basketball League |
| NPBL | National Professional Basketball League |
| NSRL | Nike Sports Research Lab |