• 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
• National Australia Bank, Australia's biggest financial institution 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
• Non Alcoholic Bar, a concept for a Bar in Vienna from Thavonat Paul, www.nab-vienna.com
• Neodymium aluminium borate
• 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
• Neuropsychological Assessment Battery, a neuropsychological test.
• "Not a Bug", a phrase used when rejecting a bug report
• Naval Amphibious Base
• NAB - Armenian classical music label. NAB stands for the Nika Albert Babaian - the name of the establisher.

am.NAB