| NAI | Annai, Guyana 
| Others |
| NAI | Nacelle Anti Ice
| Others |
| NAI | Named Area of Interest
| Others |
| NAI | NASA Astrobiology Institute
| Others |
| NAI | Nasty Agency Inc
| Others |
| NAI | National Academy of Inventors
| Others |
| NAI | National Aerospace Initiative
| Others |
| NAI | National Associates Inc
| Others |
| NAI | National Association for Interpretation
| Others |
| NAI | National Association of Interpretation
| Others |
| NAI | Native American Indians
| Others |
| NAI | Natural Alternatives International
| Others |
| NAI | Nature of Address Indicator
| Others |
| NAI | Neighborhood Academic Initiative
| Others |
| NAI | Neo-Asian Imperialist
| Others |
| NAI | Net Acid Input
| Others |
| NAI | Net Annual Income
| Others |
| NAI | Netherlands Architecture Institute
| Others |
| NAI | Network Access Identifier
| Others |
| NAI | Network Access Interrupt
| Others |
| NAI | Network Advertising Initiative
| Others |
| NAI | Network Application Interface
| Others |
| NAI | Network Associates Inc.
| Others |
| NAI | Network Associates, Incorporated
| Others |
| NAI | New America International
| Others |
| NAI | New And Improved
| Others |
| NAI | Next Added Increment
| Others |
| NAI | Nine Anonymous Inks
| Others |
| NAI | No Action Indicated
| Others |
| NAI | No Acute Infection
| Others |
| NAI | No Additional Information
| Others |
| NAI | No Adverse Impact
| Others |
| NAI | Non Accidental Injury
| Others |
| NAI | Non-Accidental Injury
| Others |
| NAI | Nordic Africa Institute
| Others |
| NAI | Normandy Allies, Inc.
| Others |
| NAI | North American Indian (Other)
| Others |
| NAI | North American Interest
| Others |
| NAI | North Atlantic Industries
| Others |
| NAI | North Atlantic Industries North Atlantic Industries
| Others |
| NAI | Not Actually Incorporated
| Others |
| NAI | Nozzle Anti-Ice
| Others |
| NAI | Nursing Assistant II
| Others |