| Abbreviation | Definition |
|---|---|
| NAI | Network Associates, Inc. |
| NAI | Network Associates, Incorporated |
| NAI | Not Actually Incorporated |
| NAIC | National Automotive Insurance Company |
| NAICS | North American Industry Classification System |
| NAII | Natural Alternatives International Inc |
| NAII | North Atlantic Internet, Inc. |
| NAIMS | Network And Internet Management Services |
| NAL | Naktuinbouw Accredited Laboratories |
| NAL | National Aeronautics Limited |
| NAL | National Automotive Lighting Products |
| NAL | North American Logistics Technology |
| NALH | Need A Little Help Bookkeeping Services, Ltd. |
| NALL | Nairobi Alpha Logistics, Ltd. |
| NAMC | Nihon Aircraft Manufacturing Corporation |
| NAMCO | National Asset Management Company Limited |
| NAMM | North American Medical Management |
| NANI | National Amusement Network Inc |
| NAOC | North Absheron Operating Company |
| NAOMI | Native American Outreach Ministries Inc |