Kvaternik is a surname. Notable people with the surname include: Dido Kvaternik (1910–1962), also Eugen Dido Kvaternik, Croatian Ustaše General-Lieutenant, son of Slavko Kvaternik Eugen Kvaternik (1825–1871), Croatian nationalist politician Slavko Kvaternik (1878–1947), Croatian military commander, one of the founders of Ustaše, father of Dido Kvaternik and brother of Petar Milutin Kvaternik Petar Milutin Kvaternik (1882–1941), Croatian politician, brother of Slavko Kvaternik