Mai martaba Karim al-Ḥussayni Shah, Aga Khan IV KBE (haife 13 Disamba 1936) ne 49th da kuma na yanzu Imam na Shi'a Ismaili Musulmi . Ya riƙe wannan muƙamin a ƙarƙashin taken Aga Khan tun 11 ga watan Yulin 1957, lokacin da, yana dan shekara 20, ya gaji kakansa, Sir Sultan Mahomed Shah Aga Khan . Yana da alhakin fassarar imani ga mabiyansa kuma yana taimakawa wajen inganta rayuwar su da al'ummomin su. Ba kamar kakansa ba, karatun sakandaren Aga Khan na yanzu yana Amurka ne a Jami'ar Harvard . Yaransa ma sun yi karatu a Amurka Tun da ya zama limami, Aga Khan ya bi sauye-sauye na siyasa da tattalin arziki waɗanda suka shafi mabiyansa. Wadannan lamura sun hada da 'yancin kan kasashen Afirka daga turawan mulkin mallaka, korar Asiya daga Yuganda ,' yancin kan ƙasashen Asiya ta Tsakiya kamar Tajikistan daga tsohuwar Tarayyar Soviet da ci gaba da hargitsi a Afghanistan da Pakistan . Aga Khan yana da sha'awar kawar da talauci a duniya; ci gaban mata; inganta al'adun Musulunci, zane-zane, da gine-gine; da kuma inganta dabi’u da yawa a cikin al’umma.