Hieronymus Vietor (c. 1480, in Liebenthal (now Lubomierz) Silesia – late 1546 or early 1547, in Kraków) was a printer and publisher born in Silesia and active in Vienna and Kraków. Famous for the quality and quantity of his prints, he is considered one of the most important early book printers in Poland, also because he was the first to regularly print in Polish. He is also known as Hieronymus Philovallensis (a latinization of the name of his birthplace, Lubomierz/Liebenthal) or Hieronymus Doliarius, or in Polish as Hieronim Wietor or Büttner.