Ubaydallāh ibn al-Hasan ibn al-Huṣayn al-ʿAnbarī (Arabic: عبيد الله بن الحسن بن الحصين العنبري‎), simply known as Ubaydallah al-Anbari (died 168 AH/784–5 AD) was an Arab jurist, poet, lexicographer, genealogist and a governor under the Abbasid Caliphate. He was highly distinguished for coining the popular saying: "kullu mujtahid musib", roughly translated as "every earnest exercise of interpretation results in an acceptable conclusion".