| Acronym | Definition |
|---|
| NAB | National Association of Broadcasters |
| NAB | National Australia Bank Limited (est. 1893) |
| NAB | New American Bible |
| NAB | National Accountability Bureau (Pakistan) |
| NAB | Not Above |
| NAB | National Allergy Bureau |
| NAB | New Arrangements to Borrow (International Monetary Fund) |
| NAB | Not A Bug |
| NAB | Notes Address Book (Lotus) |
| NAB | National Advisory Board |
| NAB | National Accreditation Board (Ghana) |
| NAB | Name and Address Book |
| NAB | Newspaper Advertising Bureau |
| NAB | North American Baptist Conference (Christian organization formerly made up of German Baptist in North America and six other countries) |
| NAB | National Association of Boards of Examiners of Long Term Care Administrators |
| NAB | Non-Alcoholic Beer |
| NAB | National Assessment Bank (Scottish education) |
| NAB | Norton AntiBot |
| NAB | Nocturnal Acid Breakthrough |
| NAB | National Association of the Blind |
| NAB | National Association for Blind |
| NAB | North American Breweries (Rochester, NY) |
| NAB | National Alliance of Businessmen |
| NAB | Novell Address Book |
| NAB | NetWare Asynchronous Board |
| NAB | Nahj Al-Balaghah (Islam; speeches and letters by Ali ibn Abi Talib) |
| NAB | No Airbag (gaming clan) |
| NAB | NATO Appeals Board |
| NAB | Naval Air/Amphibious Base |
| NAB | Navy Adjudication Board |
| NAB | Nichols Air Base (Philippines) |
| NAB | Norfolk Amphibious Base (Virginia) |
| NAB | Northwest Arctic Borough (Alaska) |
| NAB | Neue Aargauer Bank (Aarau, Switzerland) |
| NAB | Nanoparticle Albumin-Bound |
| NAB | Network Appliance Board (various companies) |
| NAB | North Atlantic Books (Berkeley, CA) |
| NAB | North American Branch (various organizations) |