Syedna Taher Saifuddin bin Syedna Mohammad Burhanuddin (????? ???? ??? ?????, 4 August 1888 – 12 November 1965) was the 51st Da'i al-Mutlaq of the Dawoodi Bohras, a section within Shia Islam.
He was the son of the 49th Da'i al-Mutlaq Mohammed Burhanuddin, whose family lineage can be traced back to Syedi Fakhruddin Shaheed.
During his reign, Taher Saifuddin RA adapted the modernisation in Western and European ideas, and over the course of it, he established its benefits for the Bohra community.
This sets him an ideal for the mixture of modernisation, education while being rooted in the traditions and the culture of the Fatimi Heritage and his son and successor Syedna Mohammad Burhanuddin and grandson and his successor Syedna Aaliqadr Mufaddal Saifuddin have continued in his path taking giant strides in the benefit of the community.