The living Imam as present guide

Nizari Ismailis affirm that a living, present Imam, descended from the Prophet through Ali and Fatima, continues in every age to guide the community, interpret the faith for its time, and hold spiritual authority. Unlike Twelver Shia, who hold that their twelfth Imam entered concealment, the Nizari line has remained manifest, its present holder bearing the title Aga Khan. The Imam is regarded not as a lawgiver above the Prophet but as the authoritative interpreter who keeps the tradition living rather than fixed.

The office passed most recently on 4 February 2025, when Aga Khan IV (Prince Karim al-Husayni), who had held the imamate since 1957, died in Lisbon at 88; his son, Prince Rahim al-Husayni, was named Aga Khan V and installed as the fiftieth hereditary Imam within days, on 11 February 2025, continuing a line the community traces to Ali through the Fatimid caliphs. Succession is not automatic by strict primogeniture: Aga Khan III, who led the community from 1885 to 1957, notably passed over his own son, Aly Khan, and named his twenty-year-old grandson Karim as successor in his will, citing the need for a leader attuned to a rapidly changing modern world, a precedent underscoring that the Imam himself designates his successor rather than descent by seniority alone determining it.

The doctrine expresses the Ismaili conviction that revelation requires continuous, authoritative interpretation adapted to changing circumstances, and it underlies the community's notable institutions of education, health, and development directed by the Imamate. It distinguishes Nizari Ismailism sharply from Sunni Islam, which recognises no such ongoing office, and from Twelver Shiism, whose Imam is awaited rather than present. The belief is inseparable from the Ismaili understanding of the batin, since the Imam is held to be the one who unlocks the inner meaning of scripture. The contrast with Twelver Shiism is precise: the twelfth Imam, Muhammad al-Mahdi, is held by Twelvers to have entered occultation beginning in 874 CE and to remain hidden until his return, so that the community has had no manifest, present Imam for over eleven centuries and relies instead on the collective juristic authority of its clergy (marja) in his absence.

Nizari Ismailis point to their own unbroken, visible line as the substantive difference the doctrine of the living Imam makes: instead of a jurisprudence developed by scholars interpreting texts in the Imam's absence, the community looks to direct guidance, embodied in recent decades in institutions such as the Aga Khan University, founded in Karachi in 1983, and the wider Aga Khan Development Network.