| Acronym | Definition |
|---|
| NIAC | National Iranian American Council (Washington, DC) |
| NIAC | Non-International Armed Conflict |
| NIAC | NASA Institute for Advanced Concepts |
| NIAC | National Infrastructure Advisory Council |
| NIAC | Nonprofits' Insurance Alliance of California |
| NIAC | Net Income Available for Common Stock (finance) |
| NIAC | National Infrastructure Advisory Committee |
| NIAC | National Internet Advisory Committee |
| NIAC | Naval Innovation Advisory Council (US Navy) |
| NIAC | National Infertility Awareness Campaign |
| NIAC | Nuclear Industry Assessment Committee |
| NIAC | Narita International Airport Corporation (Japan) |
| NIAC | Nuclear Insurance Association of Canada (Ontario, Canada) |
| NIAC | National Industry Advisory Committee |
| NIAC | Nipmuc Indian Association of Connecticut |
| NIAC | National Interagency Aviation Council (National Fire and Aviation Executive Board) |
| NIAC | National Information & Analysis Center |
| NIAC | Naval Intelligence Automation Center |
| NIAC | No I Am Chuck (blog) |
| NIAC | Navigation Interface and Autopilot Computer |