Stjepan Krizin Sakač (10 October 1890 – 23 August 1973) was a Croatian historian.
After graduating theology in Zagreb, he received his doctorate at the Pontifical Gregorian University in Rome (1915), then in Innsbruck (1920), and also in the oriental Church Sciences (1924).
[1] He was a professor in Sarajevo, and afterwards he worked in Ukraine, Poland, Belarus and Macedonia.
[1] Since 1937 he was a professor of Slavic church history, and since 1966 an honorary professor and a spiritual director at the Pontifical Oriental Institute and a board member of the Institute of St.
[1] His main work is The contract of the Pope Agathon and Croats against the naval warfare in about 679 (Ugovor pape Agatona i Hrvata proti navalnom ratu oko 679; 1931).