The Izaak Synagogue (Polish: Synagoga Izaaka), formally known as the Isaak Jakubowicz Synagogue, is an Orthodox Jewish synagogue from 1644 situated in the historic Kazimierz district of Kraków, Poland. The synagogue is named for its donor, Izaak Jakubowicz (d. 1673), also called Isaac the Rich, a banker to King Ladislaus IV of Poland. The synagogue was designed by Italian-born architect Francesco Olivierri.