The Igbo people (ˈiːboʊ , USalsoˈɪɡboʊ ; also spelled Ibo and formerly also Iboe, Ebo, Eboe, Eboans, Heebo;
natively Ṇ́dị́ Ìgbò) are an ethnic group in Nigeria. They are primarily found in Abia, Anambra, Ebonyi, Enugu, and Imo States. A sizable Igbo population is also found in Delta and Rivers States. Ethnic Igbo populations are found in Cameroon, Gabon, and Equatorial Guinea, as migrants as well as outside Africa. There has been much speculation about the origins of the Igbo people, which are largely unknown. Geographically, the Igbo homeland is divided into two unequal sections by the Niger River—an eastern (which is the larger of the two) and a western section. The Igbo people are one of the largest ethnic groups in Africa.
The Igbo language is part of the Niger-Congo language family. Its regional dialects are somewhat mutually intelligible amidst the larger "Igboid" cluster.
The Igbo homeland straddles the lower Niger River, east and south of the Edoid and Idomoid groups, and west of the Ibibioid (Cross River) cluster.
Before the period of British colonial rule in the 20th century, the Igbo were politically fragmented by the centralized chiefdoms of Nri, Aro Confederacy, Agbor and Onitsha. Frederick Lugard introduced the Eze system of "warrant chiefs". Unaffected by the Fulani War and the resulting spread of Islam in Nigeria in the 19th century, they became overwhelmingly Christian under colonization. In the wake of decolonisation, the Igbo developed a strong sense of ethnic identity. During the Nigerian Civil War of 1967–1970, the Igbo territories seceded as the short-lived Republic of Biafra. The Movement for the Actualization of the Sovereign State of Biafra and the Indigenous People of Biafra, two sectarian organizations formed after 1999, continue a non-violent struggle for an independent Igbo state.
"Igbo" as an ethnic identity developed comparatively recently, in the context of decolonisation and the Nigerian Civil War.