Diocese of Banja Luka may refer to:
Serbian Orthodox Diocese of Banja Luka, diocese (eparchy) of the Serbian Orthodox Church, in western part of Bosnia and Herzegovina. Roman Catholic Diocese of Banja Luka, diocese of the Roman Catholic Church, in western part of Bosnia and Herzegovina.
See also Banja Luka Eastern Orthodoxy in Bosnia and Herzegovina Catholic Church in Bosnia and Herzegovina Bishop of Banja Luka (disambiguation) Diocese of Mostar (disambiguation) Diocese of Sarajevo (disambiguation) Diocese of Trebinje (disambiguation)