DNB may refer to: The Dictionary of National Biography, a reference work on notable figures from British history. Diplomate of National Board, an Indian credential for healthcare providers. Drum and bass (DnB), an electronic music style. Dunbartonshire, historic county in Scotland, Chapman code. Diplôme national du brevet, the first French secondary school diploma. Organizations. German National Library (German: Deutsche Nationalbibliothek) a central library and national bibliographic centre for Germany.
https://en.wikipedia.org/wiki/DNB