A Badatz (Hebrew: בד״ץ plural batei din) is a major Jewish beth din (rabbinical court). The term is a modern one, and is an acronym for beit din tzedek ("court of Justice").
In Israel, the term Badatz is often used to refer to the Badatz of the Edah HaChareidis; however, it is not the title of this group, and other batei din use the title as well. It is often used in the context of hechsherim (kashrut certification).
In most Jewish communities, there has been a beit din, which was often headed by the rabbi of the city, hence the nickname "Rabbad" - combining "Rabbi" and "Av Beit Din." In various ultra-Orthodox communities today, there are three jewish judges serving as a local badatz.
This term is also used for kosher commercial entities in Israel.