Hebrew name: שארית יוסף
Years: 1511–1591
Primary city: Krakow
Rabbi Yosef ben Mordechai Gershon HaKohen Katz was a halachic authority in 16th-century Poland, serving as a dayan on the Krakow Beis Din. He succeeded his brother-in-law, Rabbi Moshe Isserles (the Rema), as Rosh Yeshiva and Av Beis Din of Krakow in 1572. His collection of responsa, She'eris Yosef, addresses complex questions from communities across Poland.