| NIRA | National Import Racing Association 
| Others |
| NIRA | National In-line Racing Association
| Others |
| NIRA | National Industrial Recovery Act
| Others |
| NIRA | National Inline Racing Association
| Others |
| NIRA | National Institute for Research Advancement
| Others |
| NIRA | National Insurance Recruiters Association
| Others |
| NIRA | National Intercollegiate Rodeo Association
| Others |
| NIRA | New Internet Routing Architecture
| Others |
| NIRA | New Investigator Recognition Awards
| Others |
| NIRA | Nigeria Internet Registration Association
| Others |
| NIRA | No Idiots Read Avidly
| Others |
| NIRA | Northern Illinois Rocketry Association
| Others |