Al-Risala al-Qushayriyya fi 'Ilm al-Tasawwuf (Arabic: الرسالة القشيرية في علم التصوف, lit. 'The Qushayriyyan Epistle on the Science of Sufism'), mostly known as al-Risala al-Qushayriyya (The Treatise of al-Qushayri), is one of the early complete manuals of the science of Sufism (tasawwuf in Arabic), written by the Shafi'i-Ash'ari scholar Abu al-Qasim al-Qushayri (d. 465/1074). It was written in 438/1045–6 and has been published in several editions and translated in various languages, including English, French, German, Persian, Turkish, and Urdu. It became the most widely disseminated handbook of Sufism in the Islamic world.