The Mid-Western Region was a division of Nigeria from 1963 to 1991, from 1976 being known as the Bendel state.
It was formed in June 1963 from Benin and Delta provinces of the Western Region, and its capital was Benin City. It was renamed a province in 1966, and in 1967 when the other provinces were split up into several states, it remained territorially intact, becoming a state.
During the Nigerian Civil War, the Biafran forces invaded the new Mid-Western state, en route to Lagos, in an attempt to force a quick end to the war. While under Biafran occupation, the state was declared as the "Republic of Benin" as Nigerian forces were to retake the region. The republic collapsed a day after the declaration as Nigerian troops overtook Benin City.
In 1976 the state was renamed Bendel. This was subdivided into Delta and Edo in 1991.