Aharon Perlow (Hebrew: אהרון פרלוב‎; 1839 – 1897) was the third Rebbe of the Koidanov Hasidic dynasty. He was a charismatic leader who attracted thousands of followers and effected a revival of the Koidanover dynasty founded by his grandfather, Rabbi Shlomo Chaim Perlow (1797-1862). He authored several important works that became standard texts for Koidanover Hasidim to this day, including a siddur, Seder Tefilot Yisrael Or Hayashar ("The Direct Light: Order of Prayers of Israel").