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 Litom%C4%9B%C5%99ice, he became chaplain in Arnsdorf, a post he held for eighteen years. Thenceforth to his death he was pastor in Weisskirchlitz. While chaplain, he began to collect old books, paintings, and copper-plate engravings, also gems and shells. He succeeded in collecting a small but highly-esteemed museum. 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. Especially worthy of mention are: