A coup d'état was carried out by the Sudanese Armed Forces on 30 June 1989 against the democratically elected government of Prime Minister Sadiq al-Mahdi and President Ahmed al-Mirghani. The coup was led by military officer Omar al-Bashir who took power in its aftermath; he ruled the country for the next 30 years until he was overthrown in 2019.

Sadiq al-Mahdi, also known as Sadiq as-Siddiq, was a Sudanese political and religious figure who was Prime Minister of Sudan from 1966 to 1967 and again from 1986 to 1989. He was head of the National Umma Party and Imam of the Ansar, a Sufi order that pledges allegiance to Muhammad Ahmad (1844–1885), who claimed to be the Mahdi, the messianic saviour of Islam.