Smajlagić or Smailagić is a surname. Notable people with the surname include:
Alen Smailagić (born 2000), Serbian professional basketball player Ervin Smajlagić (born 1976), Bosnian footballer Irfan Smajlagić (born 1961), Bosnian-born Croatian handball player and coach Semir Smajlagić (born 1998), Bosnian footballer Sven Smajlagić (born 1990), Croatian professional basketball player