Kalonymos or Kalonymus (Hebrew: קָלוֹנִימוּס Qālōnīmūs) is a prominent Jewish family who lived in Italy, mostly in Lucca and in Rome, which, after the settlement at Mainz and Speyer of several of its members, took during many generations a leading part in the development of Jewish learning in Germany. The family is according to many considered the foundation of Hachmei Provence and the Ashkenazi Hasidim.