Gustav Baron (Kutina, October 16, 1847 - Zagreb, March 18, 1914) was Croatian theologian, university professor and rector of the University of Zagreb.He studied theology in Vienna and Zagreb. He was ordained for a priest in 1873. He received his Ph.D in 1876 at the Faculty of Theology of the Royal University of Franz Joseph I. He was professor and chair of the Archiepiscopal Gymnasium in Zagreb. He became a docent at the Faculty of Theology in 1877, and a full professor in 1881.