| NCSL | National Capital Soccer League 
| Others |
| NCSL | National College for School Leadership
| Others |
| NCSL | National Computer Systems Laboratory
| Others |
| NCSL | National Conference of Standards Laboratory
| Others |
| NCSL | National Conference of State Legislators
| Others |
| NCSL | National Conference of State Legislatures
| Others |
| NCSL | National Conference on Student Leadership
| Others |
| NCSL | National Council of State Legislators
| Others |
| NCSL | Neumann Catholic Swim League
| Others |
| NCSL | Non Comment Source Lines
| Others |
| NCSL | North Cincy Softball League
| Others |
| NCSL | Northern California Skydiving League
| Others |
| NCSL | Northern California Swim League
| Others |
| NCSL | Northwest Christian Sports League
| Others |