Kljajić () is a surname found in Serbia, Bosnia and Croatia. It may refer to:
Dušan Kljajić (born 1963), retired Serbian footballer Filip Kljajić (footballer) (born 1990), Serbian footballer Filip Kljajić (Yugoslav Partisan) (1913–1943) Gabriele Heinen-Kljajic (born 1962), German politician Jovan Kljajić (born 2001), Montenegrin basketball player