Avraham Abba Leifer (1918 – 7 January 1990) was the second Rebbe of the Pittsburg Hasidic dynasty and the instigator for the relocation of the Hasidut from its original location in Pittsburgh, Pennsylvania to the Israeli coastal city of Ashdod. He was widely known for his yiras Shamayim (fear of Heaven), humility and friendliness toward Jews of all backgrounds.