Sheikh Bedreddin (1359–1420) (Ottoman Turkish: ??? ?????????) was an influential mystic, scholar, theologian, and revolutionary.
He is most well known for his role in a 1416 revolt against the Ottoman Empire, in which he and his disciples posed a serious challenge to the authority of Sultan Mehmed I and the Ottoman state.
His full name was Sheikh Bedreddin Mahmud Bin Israel Bin Abdulaziz.