Vincenz Hasak (b. Neustadt, near Friedland, Bohemia, 18 July 1812; d. 1 September 1889, as dean of Weisskirchlitz, near Teplice) was a Catholic historian.
After completing his classical and theological studies in Litoměřice, he became chaplain in Arnsdorf, a post he held for eighteen years.
While chaplain, he began to collect old books, paintings, and copper-plate engravings, also gems and shells.
His library became particularly famous because of the copious collection of rare early printed books, e.g. the ten pre-Reformation German translations of the Bible.
He also made a scientific use of his treasures, and wrote several books about them, notable contributions in his day to the knowledge of medieval German religious life and the German language.