Shmuel Ehrenfeld (Yiddish: שמואל עהרענפעלד, 1891–1980), known as the Mattersdorfer Rav, was a pre-eminent Orthodox Jewish rabbi in pre-war Austria and a respected Torah leader and community builder in post-war America. He established in New York City and taught thousands of students who went on to become leaders of American Torah Jewry. He also founded the neighborhood of Kiryat Mattersdorf in Jerusalem, where his son and grandson became prominent Torah educators. He was the great-great-grandson of the Chasam Sofer through the Chasam Sofer's daughter Hindel, who married Rabbi Dovid Tzvi Ehrenfeld.