The Addis Ababa Agreement, also known as the Addis Ababa Accord, was a set of compromises within a 1972 treaty that ended the First Sudanese Civil War (1955–1972) fighting in Sudan. The Addis Ababa accords were incorporated in the Constitution of Sudan.
The Agreement had the goal to address and appease concerns of the southern Sudan liberation and secession movement, as the First Sudanese Civil War grew costly in lives and resources to the northern Sudanese government and southern population. The Addis Ababa Agreement's establishment of the Southern Sudan Autonomous Region gave a degree of autonomy.
A decade of relative peace followed, though the Addis Ababa Agreement failed to dispel the tensions that had originally caused civil war. The Addis Ababa Agreement proved to be only temporary respite. Resource infringements and marginalisation by the north led to increased unrest in the south starting in the late 1970s.
In 1983 President Gaafar Nimeiry declared all Sudan an Islamic state under Shari'a law, including the non-Islamic majority southern region. The Southern Sudan Autonomous Region was abolished on 5 June 1983, ending the Addis Ababa Agreement. This initiated the Second Sudanese Civil War (1983–2005).