| NIAC | NASA Innovative Advance Concepts 
| Others |
| NIAC | NASA Innovative Advanced Concepts
| Others |
| NIAC | NASA Institute for Advanced Concepts
| Others |
| NIAC | National Indoor Athletics Centre
| Others |
| NIAC | National Infrastructure Advisory Council
| Others |
| NIAC | National Initiatives And Collaboration
| Others |
| NIAC | National Interagency Aviation Committee
| Others |
| NIAC | National Iranian American Council
| Others |
| NIAC | Naval Innovation Advisory Council
| Others |
| NIAC | Nebraska Information Analysis Center
| Others |
| NIAC | Nebraska-Iowa Athletic Conference
| Others |
| NIAC | Net Income Available for Common
| Others |
| NIAC | Network Improvement and Accountability Collaborative
| Others |
| NIAC | Network Incident Analysis Cell
| Others |
| NIAC | Neuroimaging Informatics and Analysis Center
| Others |
| NIAC | Nissho Iwai American Corporation
| Others |
| NIAC | Nonprofits Insurance Alliance of California
| Others |
| NIAC | Northern Indiana Athletic Conference
| Others |
| NIAC | Northern Intercollegiate Athletic Conference
| Others |
| NIAC | Northern Ireland Assembly Commission
| Others |
| NIAC | Northwest Institute for Advanced Computing
| Others |
| NIAC | Nuclear Industry Assessment Committee
| Others |