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

Nab may refer to:

• National Australia Bank, one of the Big four Australian banks
• National Association of Broadcasters
• Nab Tower, a lighthouse in England
• The Nab, a fell in the English Lake District
• New American Bible, Catholic Bible translation most commonly used in English language churches

A Neutralizing antibody, or NAb is an antibody which defends a cell from an antigen or infectious body by inhibiting or neutralizing any effect it has biologically. An example of a neutralizing antibody is diphtheria antitoxin, which can neutralize the biological effects of diphtheria toxin.

Die Abkürzung NAB steht für:

• Neue Aargauer Bank, Schweizer Regionalbank
• National Australia Bank, Bank in Australien
• National Association of Broadcasters, US-amerikanischer Medien-Interessenverband
• Nerf Arena Blast, Computerspiel

NAB peut signifier:

• National Association of Broadcasters,
• National Australia Bank, la banque nationale d'Australie,