The Diocese of Duvno was a Latin rite particular church of the Catholic Church that was established in the 14th century with a seat in present-day Tomislavgrad in Bosnia and Herzegovina. It was a suffragan diocese of the Archdiocese of Split, and during the 17th century of the Archdiocese of Dubrovnik. The diocese consisted of four parishes: Roško Polje, Duvno, Posušje and Rama.