Oto Luthar (born 11 August 1959) is a Slovenian historian. Since 1992, he has served as the director of the Scientific Research Centre of the Slovenian Academy of Sciences and Arts in Ljubljana, the largest research institution in Slovenia. He has written on numerous subject, including history and theory of historiography, history of European Jews, especially their relation to Slavic peoples, and social history of World War I. Since 2003, he is also head of the graduate program of cultural studies at the University of Nova Gorica. He is married to cultural critic and sociologist Breda Luthar.