Abu Sa'id Mirza (Chagatay/Persian: ابو سعید میرزا‎; 1424 – 8 February 1469) was the ruler of the Timurid Empire during the mid-fifteenth century. Born a minor prince of the Timurid dynasty, Abu Sa'id quickly established himself as the most prominent among his warring relations. Over the course of two decades, he reunified much of the Timurid Empire, which had become fractured in the aftermath of the death of his great-uncle Shah Rukh. However, Abu Sa'id's hopes of restoring the empire to its former extent at the time of Timur ultimately failed after he was killed during an invasion of what is now western Iran. He was the paternal grandfather of Babur, who later founded the Mughal Empire of India.