David ben Solomon ibn (Abi) Zimra (Hebrew: ר׳ דָּוִד בֶּן שְׁלֹמֹה אִבְּן אָבִי זִמְרָא) (1479–1573) also called the Radbaz (רַדְבָּ״ז) after the initials of his name, Rabbi David ben Zimra, was an early acharon of the fifteenth and sixteenth centuries who was a leading posek, rosh yeshiva, chief rabbi, and author of more than 3,000 responsa (halakhic decisions) as well as several scholarly works.

[2] For unknown reasons, he left the Land of Israel aged 31 or 32 and traveled to Wattasinid Fez, where he became a member of the beth din (rabbinical court) presided over by the nagid Isaac Sholal.

According to Akrish, the Radbaz was prominent in both the social and the political life of Egypt thanks to his status as a wealthy intellectual.

During the time he served as Chief Rabbi, he introduced many reforms to the everyday life and religion of the Egyptian Jews.

Upon attaining the age of 90, the Radbaz resigned the chief rabbinate and divided the greater part of his fortune among the poor, making special provision for Torah scholars.

He settled in Safed, capital of the Safad Sanjak, where he became an active member of the rabbinical court presided over by Joseph Karo, who held him in great esteem.

Jewish Encyclopedia bibliography: David Conforte, Dore ha-Dorot, p. 36b; Azulai, Shem ha-Gedolim, i.44; Moritz Steinschneider, Cat.