Nachman of Breslov (Hebrew: נחמן מברסלב‎), also known as Reb Nachman of Bratslav, Reb Nachman Breslover (Yiddish: רב נחמן ברעסלאווער), Nachman from Uman (April 4, 1772 – October 16, 1810), was the founder of the Breslov Hasidic movement.

Rebbe Nachman, a great grandson of the Baal Shem Tov, breathed new life into the Hasidic movement by combining the esoteric secrets of Judaism (the Kabbalah) with in-depth Torah scholarship. He attracted thousands of followers during his lifetime and his influence continues until today. Rebbe Nachman's religious philosophy revolved around closeness to God and speaking to God in normal conversation "as you would with a best friend." The concept of hitbodedut is central to his thinking.

Rebbe Nachman was born in the town of Medzhybizh, Ukraine. His mother, Feiga, was the daughter of Adil (also spelled Udel), daughter of the Baal Shem Tov, founder of Hasidic Judaism. His father Simcha was the son of Rabbi Nachman of Horodenka (Gorodenka), one of the Baal Shem Tov's disciples, after whom Rebbe Nachman was named. Rebbe Nachman had two brothers, Yechiel Zvi and Yisroel Mes, and a sister, Perel.