Birn or variants may refer to:
BIRN Biomedical Informatics Research Network (BIRN), a geographically distributed virtual community of shared resources relating to diagnosis and treatment of disease Balkan Investigative Reporting Network Berklee College of Music Internet Radio Network
Birn or Birns Alex Birns (1907–1975), Jewish American mobster Jack Birns (1919-2008), American photographer Jerry Birn (1923-2009), American television writer Laura Birn (born 1981), Finnish actress Laura Bryan Birn (born 1965), American actress
Other uses Dál Birn Lóegaire Birn Búadach, Óengus Osrithe's son Nem Moccu Birn (died 654), Irish saint