Yarsanism (Kurdish: یارسان, romanized: Yarsan), Ahl-e Haqq (Kurdish: ئەهلی حەق, romanized: Ehlî Ḧeq; Persian: اهل حق), or Kaka'i, is an inherited, syncretic religion founded by Sultan Sahak in the late 14th century in western Iran. The total number of followers of Yarsanism is estimated to be over half a million to one million in Iran. The numbers in Iraq are unknown. The adherents are mostly Kurds, as well as some Shabaks, Laks, and Lurs.
Some Yarsanis in Iraq are called Kaka'i. Yarsanis say that some people call them disparagingly as "Ali Allahi" or "worshipers of Ali", labels which Yarsanis deny. As such, many Yarsanis hide their religious identity, and there are no exact statistics of their population.