Đuro Hranić was ordained as a priest of the Roman Catholic Archdiocese of Đakovo-Osijek on June 29, 1986. He served as parish vicar in Osijek (1986-1987), prefect of Đakovo seminary (1993-1996), professor of dogmatic theology at the Đakovo Catholic Theological Faculty (since 1993), assistant of laity students at the same Faculty (1993-1998), Deputy Head of Chair of Theology (since 1997), assistant professor at the Department of Dogmatic Theology at the Catholic Theological Faculty of the University of Zagreb for the needs of the regional studies in Đakovo (since 2000), Secretary General of the Second Synod of Roman Catholic Archdiocese of Đakovo-Osijek (since 1998), member of the Presbyterian Council of the same (since 1994), member of the Council of consultors of the Archdiocese of Đakovo-Osijek (since 2000), member of the Episcopal Commission for Laity of the Croatian Bishops' Conference, and editor in chief of the diocesan monthly Vjesnik of Archdiocese of Đakovo-Osijek (since 1994).