Yekusiel Yehuda Teitelbaum (III), known by the Yiddish colloquial name Zalman Leib (born 23 December 1951), is one of the two Grand Rebbes of Satmar. He leads the dynasty's Williamsburg, Brooklyn faction, which is based at the community's central Congregation Yetev Lev D'Satmar on Rodney Street there. He is the dean of a Satmar yeshiva in Queens, New York.

Satmar is a Hasidic group founded in 1905 by Grand Rebbe Joel Teitelbaum, in the city of Szatmárnémeti, Hungary. The group is an offshoot of the Sighet Hasidic dynasty. Following World War II, it was re-established in New York.