Aljančić is a surname. Notable people with the surname include:
Ernest Aljančič (1916–2006), Slovenian ice hockey player and official Ernest Aljančič Jr. (1945–2021), Slovenian ice hockey player and ice hockey official Janez Aljančič (born 1982), Slovenian footballer Slobodan Aljančić (1922–1993), Serbian mathematician