Chona Menachem Mendel (Mendel) Weinbach (September 24, 1933 – December 11, 2012) was an Orthodox Jewish rabbi, educator, author, and speaker. As the co-founder and dean of Ohr Somayach Institutions, a Jerusalem-based yeshiva for newly-observant Jewish men, he was considered one of the fathers of the modern-day baal teshuva movement.