Iranian Kurdistan or Eastern Kurdistan (Kurdish: Rojhilatê Kurdistanê, ڕۆژھەڵاتی کوردستان) is an unofficial name for the parts of northwestern Iran inhabited by Kurds which borders Iraq and Turkey. It includes the West Azerbaijan Province, Kurdistan Province, Kermanshah Province, Ilam Province and Hamadan Province. There is also a significant Kurdish population in the North Khorasan Province.
Kurds generally consider Iranian Kurdistan (Eastern Kurdistan) to be one of the four parts of a Greater Kurdistan, which also includes parts of southeastern Turkey (Northern Kurdistan), northern Syria (Western Kurdistan), and northern Iraq (Southern Kurdistan).
According to the last census conducted in 2006, the four Kurdish-inhabited provinces in Iran – West Azerbaijan, Kermanshah Province, Kurdistan Province, and Ilam Province – have a total population of 6,730,000. Pockets of Lurs inhabit the southern areas of Ilam Province.
From 4 to 5 million Iranian Kurds are predominantly Sunni. Shia Kurds are called Feyli.They inhabit Kermanshah and areas around Kheneghin except for those parts where people are Jaff, and Ilam Province; as well as some parts of Kurdistan and Hamadan provinces. The Kurds of Khorasan Province in northeastern Iran are also adherents of Sunni Islam. During the Shia revolution in Iran the major Kurdish political parties were unsuccessful in absorbing Shia Kurds, who at that period had no interest in autonomy. However, since the 1990s Kurdish nationalism has seeped into the Shia Kurdish area partly due to outrage against government’s violent suppression of Kurds farther north.