NAB may stand for:
- Name and address book
- National Assessment Bank, an internal exam used by the Scottish Qualifications Authority
- National Association of Broadcasters, the industry group representing the commercial radio stations and television stations of the United States
- NAB Show, an annual trade show produced by the group
- National Australia Bank, one of Australia's biggest financial institutions and one of the world's top 30 financial services companies
- National Accountability Bureau, Pakistani government agency dealing with corruption.
- Needle aspiration biopsy, a medical technique
- Neodymium aluminium borate
- Neuropsychological Assessment Battery, a battery of 33 neuropsychological tests developed to assess a wide array of neuropsychological skills and functions in adults 18-97 years of age
- New American Bible, an English Bible translation that was produced by members of the Roman Catholic biblical scholars in cooperation with the United States Conference of Catholic Bishops
- Nerf Arena Blast, a computer game
- National Archives of Bangladesh
- Nickel-aluminum bronze