The Angolan Civil War (Portuguese: Guerra Civil Angolana) was a civil war in Angola, beginning in 1975 and continuing, with interludes, until 2002. The war immediately began after Angola became independent from Portugal in November 1975. The war was a power struggle between two former anti-colonial guerrilla movements, the communist People's Movement for the Liberation of Angola (MPLA) and the turned anti-communist National Union for the Total Independence of Angola (UNITA). The war was used as a surrogate battleground for the Cold War by rival states such as the Soviet Union, Cuba, South Africa and the United States.The MPLA and UNITA had different roots in Angolan society and mutually incompatible leaderships, despite their shared aim of ending colonial rule. A third movement, the National Front for the Liberation of Angola (FNLA), having fought the MPLA with UNITA during the war for independence, played almost no role in the Civil War. Additionally, the Front for the Liberation of the Enclave of Cabinda (FLEC), an association of separatist militant groups, fought for the independence of the province of Cabinda from Angola. With the assistance of Cuban soldiers and Soviet support, the MPLA managed to win the initial phase of conventional fighting, oust the FNLA from Luanda and become the de facto Angolan government. The FNLA disintegrated, but the U.S. and South Africa-backed UNITA continued its irregular warfare against the MPLA-government from its base in the east and south of the country.

The 27-year war can be divided roughly into three periods of major fighting from 1975 to 1991, 1992 to 1994 and from 1998 to 2002 with fragile periods of peace. By the time the MPLA achieved victory in 2002, between 500,000 and 800,000 people had died and over one million had been internally displaced. The war devastated Angola's infrastructure and severely damaged public administration, the economy and religious institutions.

The Angolan Civil War was notable due to the combination of Angola's violent internal dynamics and the exceptional degree of foreign military and political involvement. The war is widely considered a Cold War proxy conflict, as the Soviet Union and the United States, with their respective allies, provided assistance to the opposing factions. The conflict became closely intertwined with the Second Congo War in the neighbouring Democratic Republic of the Congo and the South African Border War. Land mines still litter the countryside and contribute to the ongoing civilian casualties.

Angola ( (listen); Portuguese: [ɐ̃ˈɡɔlɐ]), officially the Republic of Angola (Portuguese: República de Angola), is a country on the west coast of Southern Africa. It is the second-largest Lusophone (Portuguese-speaking) country in both total area and population (behind Brazil), and is the seventh-largest country in Africa. It is bordered by Namibia to the south, the DR Congo to the north, Zambia to the east, and the Atlantic Ocean to the west. Angola has an exclave province, the province of Cabinda, that borders the Republic of the Congo and the Democratic Republic of the Congo. The capital and most populated city is Luanda.

Angola has been inhabited since the Paleolithic Age. Its formation as a nation-state originates from Portuguese colonisation, which initially began with coastal settlements and trading posts founded in the 16th century. In the 19th century, European settlers gradually began to establish themselves in the interior. The Portuguese colony that became Angola did not have its present borders until the early 20th century, owing to resistance by native groups such as the Cuamato, the Kwanyama and the Mbunda.

After a protracted anti-colonial struggle, Angola achieved independence in 1975 as a Marxist–Leninist one-party Republic. The country descended into a devastating civil war the same year, between the ruling People's Movement for the Liberation of Angola (MPLA), backed by the Soviet Union and Cuba, the insurgent anti-communist National Union for the Total Independence of Angola (UNITA), supported by the United States and South Africa, and the militant organisation National Liberation Front of Angola (FNLA), backed by the Democratic Republic of the Congo. The country has been governed by MPLA ever since its independence in 1975. Following the end of the war in 2002, Angola emerged as a relatively stable unitary, presidential constitutional republic.

Angola has vast mineral and petroleum reserves, and its economy is among the fastest-growing in the world, especially since the end of the civil war; however, economic growth is highly uneven, with most of the nation's wealth concentrated in a disproportionately small sector of the population and highly concentrated in China and in the United States. The standard of living remains low for most Angolans; life expectancy is among the lowest in the world, while infant mortality is among the highest.

Since 2017, the government of João Lourenço has made fighting corruption its flagship, so much so that many individuals of the previous government are either jailed or awaiting trial. Whilst this effort has been recognised by foreign diplomats to be legitimate, some skeptics see the actions as being politically motivated.Angola is a member of the United Nations, OPEC, African Union, the Community of Portuguese Language Countries, and the Southern African Development Community. As of 2021, the Angolan population is estimated at 32.87 million. Angola is multicultural and multiethnic. Angolan culture reflects centuries of Portuguese rule, namely the predominance of the Portuguese language and of the Catholic Church, intermingled with a variety of indigenous customs and traditions.