Abū Dhar al-Ghifari al-Kinani ( أبو ذر الغفاري الكناني), also Jundub ibn Junādah ibn Sufian (جُندب بن جَنادة), was the fourth or fifth person converting to Islam. He belonged to the Banu Ghifar, the Kinanah tribe. No date of birth is known. He died in 652 CE, at al-Rabadha, in the desert east of Medina.

Abu Dhar is remembered for his strict piety and also his opposition to Muawiyah I during the caliph Uthman era. He is venerated by Shia Muslims as one of The Four Companions, early Muslims who were followers (Shi'a) of Ali (Ali ibn Abi Talib).

He was one of the Muhajirun. He was regarded by many, including Ali Shariati, as the first Islamic socialist or the first socialist altogether, having first been referred to as such by the Arab scholar Ahmad Rida in 1910.

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