NNBA
| Acronym | Definition |
|---|---|
| NNBA | National Nurses in Business Association |
| NNBA | Navajo Nation Bar Association |
| NNBA | Northern Nevada Bluegrass Association |
| NNBA | National Negro Bowling Association (founded 1939; now The National Bowling Association) |
| NNBA | Native National Basketball Association (Ontario, Canada) |
| NNBA | National Negro Bar Association |
| NNBA | Northwest National Bank of Arlington (Arlington, TX) |