Ibn al-Arif (nickname) or Abu al-Abbas Ahmad ibn Mohammed ibn Musa ibn Ata Allah al-Mariyyi al-Sanhaji, also known as Al-Urruf (July 24, 1088 – September 27, 1141) was a famous Andalusian Sufi.
He is especially well known as the founder of a Sufi school or tariqa, which was based on the teachings of Ibn Masarra, and as the author of Mahasin al-Majalis (The Attractions of Mystical Sessions).