Kurdistan (Kurdish: کوردستان, romanized: Kurdistan, lit. 'land of the Kurds'; [ˌkʊɾdɪˈstɑːn] ), or Greater Kurdistan, is a roughly defined geo-cultural region in West Asia wherein the Kurds form a prominent majority population and the Kurdish culture, languages, and national identity have historically been based. Geographically, Kurdistan roughly encompasses the northwestern Zagros and the eastern Taurus mountain ranges.

Kurdistan generally comprises the following four regions: southeastern Turkey (Northern Kurdistan), northern Iraq (Southern Kurdistan), northwestern Iran (Eastern Kurdistan), and northern Syria (Western Kurdistan). Some definitions also include parts of southern Transcaucasia. Certain Kurdish nationalist organizations seek to create an independent nation state consisting of some or all of these areas with a Kurdish majority, while others campaign for greater autonomy within the existing national boundaries. Though, the delineation of the region remains disputed and varied, with some maps greatly exaggerating its boundaries.

Historically, the word "Kurdistan" is first attested in 11th century Seljuk chronicles. Many disparate Kurdish dynasties, emirates, principalities, and chiefdoms were established from the 8th to 19th centuries. Administratively, the 20th century saw the establishment of the short-lived areas of the Kurdish state (1918–1919), Kingdom of Kurdistan (1921–1924), Kurdistansky Uyezd i.e. "Red Kurdistan" (1923–1929), Republic of Ararat (1927–1930), and Republic of Mahabad (1946).