Zubaidah bint Ja`far ibn Mansur (Arabic: زبيدة بنت جعفر ابن المنصور) (died 831 AD) was the wife of Harun al-Rashid and the granddaughter of al-Mansur, founder of Baghdad. She was a devout Muslim and a wise ruler who personally funded a new water system for pilgrims to Mecca. Her birthdate is unknown but she was at least a year younger than Harun. Her name was a nickname meaning "little butter ball," given to her by her grandfather. Her birth name was Sukhainah or Amat al-'Aziz. Her son was the Abbasid caliph Muhammad al-Amin, and her stepson was 'Abdullah al-Ma'mun.