DNB may refer to:

• Dance Notation Bureau, a non-profit organization founded to preserve choreographic works
• De Nederlandsche Bank, the Dutch central bank
• Departure from nucleate boiling, in boiling heat transfer
• The Day/Night Band, the high sensitivity channel of the Visible Infrared Imaging Radiometer Suite (VIIRS) on board the Suomi NPP and Joint Polar Satellite System (JPSS) series satellites capable of night time imaging.
• Deutsche Nationalbibliothek, the German National Library
• Deutsches Nachrichtenbüro, a Nazi German news agency administered by Heinz Lorenz
• The Dictionary of National Biography, a reference work on notable figures from British history
• Diplomate of National Board, an Indian credential for healthcare providers
• DNB ASA, a Norwegian financial services group
  • Den norske Bank (DnB), a former Norwegian bank, now part of DNB ASA
• Drum and bass (DnB), an electronic music style
• Dunbartonshire, historic county in Scotland, Chapman code
• Dun & Bradstreet (retired NYSE ticker symbol DNB), an American business information company