Baba Rukn al-Din Shirazi

• Name — Mas'ūd ibn ʿAbd Allah Bayḍawi • Titles — Baba Rukn al-Din • Birth Name — Masoud ibn Abdullah al-Baydawi • Birthplace — Shiraz • Died — 1367 or 1368 • Place of death — Isfahan • Venerated In — Shi'ism and sects of Sunnism who venerate mystics • Major Shrine — Mausoleum of Baba Rokneddin in Takht-e Foulad cemetery, Isfahan, Iran • Influences — Ibn Arabi, Abd al-Razzaq Kāshānī, Dawud al-Qaysari, Nu'man al-Khwarizmi Mas'ūd b. ʿAbd Allah al-Bayḍawi (Persian: مسعود ب. عبدالله بیضایی) more commonly known as Baba Rukn al-Din Shirazi or Baba Rokneddin Shirazi (died 1367 or 1368) was a 14th-century Sufi mystic and follower of Ibn Arabi. His name means Father Rukn al-Din, the latter which transliterates as "Pillar of the Faith."

From childhood, Masud ibn Abdullah had an interest in Sufism. He eventually studied and learned spirituality and started his mystical journey at a young age. He studied the basics of Sufism under Abdul Razzaq al-Kashani. He then studied the Fusus al-Hikam of Ibn Arabi under Dawud al-Qaysari, with help from Nu'man al-Khwarizmi. In adulthood, he wrote many works on Sufism and scholarly knowledge, such as a commentary and exegesis of the Fusus al-Hikam.

Some of his most famous works: • Nusus al-khusus fi tarjimat al-fusus: A commentary and exegesis on Ibn Arabi's Fusus al-Hikam. It was reprinted in 1980 by Tehrani publishers. • Kashf al-durr fi nazm al-durr: A commentary on the al-Ta'iya al-kubra work from Ibn Farid. This work exists in manuscript format, and is preserved in national libraries in Iran.