| NRRL | American Research Service (ARC) culture collection or (NRRL). The Northern Regional Research Laboratory (now the National Center For Agricultural Utilization Research) opened in 1940. 
| Others |
| NRRL | NeuroRehabilitation Research Laboratory
| Others |
| NRRL | New River Regional Landfill
| Others |
| NRRl | Noise Reduction Rating for the Lower-rated protector
| Others |
| NRRL | Norwegian Radio Relay League
| Others |