Divjak is a Serbo-Croatian surname. Notable people with the surname include:
Blaženka Divjak (born 1967), Croatian mathematician and politician Boris Divjak (born 1972), macroeconomics consultant from Bosnia and Herzegovina Jovan Divjak (1937–2021), Bosnian general in the Bosnian army Zdravko Divjak (born 1956), Yugoslav swimmer Michael (Mico) Divjak (born 1960), Canadian insurance industry executive (retired)
See also Divac, surname Divjakë, settlement in western Albania