| NBCA | Narrow Burst Cutting Area 
| Others |
| NBCA | National Baptist Convention of America
| Others |
| NBCA | National Basketball Coaches Association
| Others |
| NBCA | National Bible College Accreditation
| Others |
| NBCA | National Bible College Association
| Others |
| NBCA | National Biblical Counselors Association
| Others |
| NBCA | National Biodiversity Conservation Area
| Others |
| NBCA | National Black College Alumni
| Others |
| NBCA | National Blood Clot Alliance
| Others |
| NBCA | National Board Certification Agency
| Others |
| NBCA | National Board of Collection Attorneys
| Others |
| NBCA | National Bond Claims Association
| Others |
| NBCA | New Beginnings Christian Academy
| Others |
| NBCA | New Bern Christian Academy
| Others |
| NBCA | New Braunfels Christian Academy
| Others |
| NBCA | New Brighton Christian Assembly
| Others |
| NBCA | New Brunswick Court of Appeal
| Others |
| NBCA | New Brunswick Curling Association
| Others |
| NBCA | North Bay Christian Academy
| Others |
| NBCA | North Buckhead Civic Association
| Others |
| NBCA | NTN Bearing Corporation of America
| Others |