'Ala' al-Dawla Simnani was a Persian Sūfī of the Kubrāwī order, a writer and a teacher of Sufism. He was born in Semnan, Iran. He studied the tradition of Sufism from Nur al-Din Isfarayini. He also wrote many books on Sufism and Islam. Among his students were Mir Sayyid Ali Hamadani and Ashraf Jahangir Semnani