Birk is both a surname and a masculine given name. Notable people with the name include:
Surname:
Ado Birk (1883–1942), Estonian former Prime Minister
Alma Birk (1917–1996), English journalist and politician
Anne Birk (1942–2009), German writer
Matt Birk (born 1976), American professional football player
Raye Birk (born 1943), American actor
Thomas Birk (born 1988), German footballer
Yehudith Birk (1926–2013), Polish-born Israeli biochemist
Given name:
Birk Anders (born 1964), German biathlete
Birk Engstrøm (born 1950), Norwegian footballer
Birk Sproxton (1943–2007), Canadian poet and novelist
Fictional character:
Birk Balthazar, father of Sofia the First