Ziyad ibn Ubayd Allah al-Harithi (Arabic: زياد بن عبيد الله الحارثي) (full name Ziyad ibn Ubayd Allah ibn Abd Allah ibn Abd al-Madan al-Harithi) was an eighth century Abbasid governor of Medina and Mecca from 750 to 758 for the Abbasid Caliphate.
He was the second Abbasid Caliphal governor of Medina and Mecca.
His sister, Rayta bint Ubayd Allah was married to Muhammad ibn Ali al-Hashimi who was the father of the first Abbasid caliph al-Saffah.
Al-Saffah appointed his paternal uncle, Dawud ibn Ali al-Hashimi[1][2] as the first governor of Medina and Mecca in 750, however he died in office that same year.
Al-Saffah then appointed Ziyad ibn Ubayd Allah, his maternal uncle[3] as governor in 750.