In Judaism, a rabbi /ˈræbaɪ/ is a teacher of Torah. This title derives from the Hebrew word רַבִּי rabi [ˈʁäbi], meaning "My Master" (irregular plural רבנים rabanim [ʁäbäˈnim]), which is the way a student would address a master of Torah. The word "master" רב rav [ˈʁäv] literally means "great one".

The basic form of the rabbi developed in the Pharisaic and Talmudic era, when learned teachers assembled to codify Judaism's written and oral laws. In more recent centuries, the duties of the rabbi became increasingly influenced by the duties of the Protestant Christian minister, hence the title "pulpit rabbis", and in 19th-century Germany and the United States rabbinic activities including sermons, pastoral counseling, and representing the community to the outside, all increased in importance.

Within the various Jewish denominations there are different requirements for rabbinic ordination, and differences in opinion regarding who is to be recognized as a rabbi. Orthodox Judaism does not ordain women as rabbis, but other strands do.