Vlašić () is a Serbo-Croatian toponym and surname. It is sometimes rendered as Wlassics in Hungarian. It may refer to:
Toponyms Vlašić (Bosnia and Herzegovina), a mountain in Bosnia and Herzegovina Vlašić (Serbia), a mountain in Serbia
People Vlašić, Croatian surname Alex Vlasic, American ice hockey player Blanka Vlašić, Croatian athlete Franjo Vlašić, Croatian ban Frank Vlašić, founder of Vlasic Pickles Joško Vlašić, Croatian athletics coach Marc-Édouard Vlasic, Canadian ice hockey player Mark Vlasic, American football player Nikola Vlašić, Croatian footballer Nikolai Vlasik, Soviet general Perica Vlašić, Croatian rower Tomislav Vlašić, Croatian ex-priest Gyula Wlassics (1852–1937), Hungarian politician Tibor Wlassics, Hungarian scholar
Other uses Vlašić cheese, a brined mostly low-fat white cheese made from sheep-milk Vlasic Pickles, a company specializing in pickled products