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Syedna Abdullah Fakhruddin was the 16th Dai of Taiyabi Musta‘lī Dawoodi Bohra Islam(Death: 9th Ramadan al-Moazzam 809H/ 16 Feb 1407AD, Zimarmar-Yemen). He succeeded the 15th Dai Syedna Abbas Bin Syedna Mohammad to the religious post.
The grave of the dai along with 14th and 17th Dai ( big square platform) are at Zimarmar Fort which is on the top of hill. The small square is grave of their associate (mazoon). On the hill top there still exist remains of Mosque, buildings and water reservoirs.
Abdullah Fakhruddin became Da'i al-Mutlaq in 779AH  /1345AD. His period of Dawat was from 779-809AH (1377-1406 AD) for about 29 years (Hijri), 11 months, 1 day.
His Mazoon (Associate) was: Syedna Ali ash-Shaibani, Syedna Husain and Syedna Hasan Mukasir: Syedi Abdul Muttalib bin Syedna Abdullah
Syedna conferred nass upon 17th Dai Syedna Hasan Badruddin - his son.
- List of Syednas (according to Dawoodi Bohras)
- The Ismaili, their history and doctrine by Farhad Daftary(Chapter -Mustalian Ismailism-p. 300-310)
- The Uyun al-akhbar is the most complete text written by an Ismaili/Tayyibi/Dawoodi 19th Dai Sayyedna Idris bin Hasan on the history of the Ismaili community from its origins up to the 12th century CE period of the Fatimid caliphs al-Mustansir (d. 487/1094), the time of Musta‘lian rulers including al-Musta‘li (d. 495/1101) and al-Amir (d. 524/1130), and then the Tayyibi Ismaili community in Yemen.