| Abbreviation | Definition |
|---|---|
| NABEI | The National Association of Bangsamoro Education, Inc. |
| NABI | Northern Alberta Business Incubator |
| NABISCO | National Biscuit Company |
| NABR | North American Bioenergy Resources |
| NABV | Nederlands Antilliaanse Besloten Vennootschap |
| NAC | National Airways Corporation |
| NAC | National Analysis Center |
| NAC | Net Access Corporation |
| NAC | New Age Consulting |
| NAC | Northrop Aerospace Conglomerate |
| NACA | Neighborhood Assistance Corporation of America |
| NACC | North American Calibration Cooperation |
| NACC | North American Capacitor Company |
| NACC | North American Choral Company |
| NACC | North American Communication Corporation |
| NACE | Navajo Arts And Crafts Enterprise |
| NACHA | National Automated Clearing House Association |
| NACI | North American Collectors Inc |
| NACI | North American Conveyor Inc |
| NACIL | National Aviation Company of India Limited |