Taher Saifuddin, Indian spiritual leader, 51st Da'i al-Mutlaq (born 1888)

Taher Saifuddin, also known as Tahir Sayf al-Din, was the 51st and longest serving Da'i al-Mutlaq of the Dawoodi Bohras. Saifuddin adapted the modernisation in Western and European ideas, and established its benefits for the Bohras, whilst still steeped in the traditions and the culture of the community's Fatimid heritage. Saifuddin laid substantial groundwork in terms of philanthropy, education, entrepreneurship, social outreach, political outreach, and community upliftment upon which his successors continued to build, resulting in an unprecedented era of prosperity among the Dawoodi Bohras.

Da'i al-Mutlaq is the most senior spiritual rank and office in Tayyibi Isma'ilism. The Da'i al-Mutlaq has headed the Tayyibi community since the seclusion of the 21st Tayyibi Imam, at-Tayyib Abu'l-Qasim, traditionally placed in 528 AH/1134 AD.