Ṣakhr b. Ḥarb b. Umayyah (Arabic: صَخْرِ ٱبْن حَرْب ٱبْن أُمَيَّةَ, c. 567—653), commonly known by his kunya Abū Sufyān ﵁ (Arabic: أَبُو سُفْيَانُ), was a prominent opponent-turned companion and father-in-law of the Prophet ﷺ. He was the father of the first Umayyad caliph Muʿāwiyah ﵁ (r. 661–680) and namesake of the Sufyanid line of Umayyad caliphs which ruled from 661 to 684.
Abū Sufyān ﵁ was a leader and merchant from the Quraysh tribe of Mecca. During his early career, he often led trade caravans to Syria. He had been among the main leaders of Makkan opposition to the Prophet ﷺ, commanding the Makkans at the battles of Uḥud and Khandaq in 625 and 627 CE. However, when the Prophet ﷺ entered Makkah in 630, he was among the first to submit and was given a stake in the nascent Muslim state, playing a role at the Battle of Hunayn and the subsequent destruction of the polytheistic sanctuary of al-Lat in Ta'if. After the Prophet's ﷺ death, he may have been appointed as the governor of Najran by Caliph Abū Bakr ﵁ (r. 632–634) for an unspecified period. Abū Sufyān ﵁ later played a supporting role in the Muslim army at the Battle of the Yarmuk against the Byzantines in Syria.