The National Union for the Total Independence of Angola (Portuguese: União Nacional para a Independência Total de Angola, abbr. UNITA) is the second-largest political party in Angola. Founded in 1966, UNITA fought alongside the Popular Movement for the Liberation of Angola (MPLA) in the Angolan War for Independence (1961–1975) and then against the MPLA in the ensuing civil war (1975–2002). The war was one of the most prominent Cold War proxy wars, with UNITA receiving military aid initially from People's Republic of China from 1966 until October 1975 and later from the United States and apartheid South Africa while the MPLA received support from the Soviet Union and its allies, especially Cuba.

Until 1996, UNITA was funded through Angolan diamond mines in both Lunda Norte and Lunda Sul along the Cuango River valley, especially the Catoca mine, which was Angola's only Kimberlite mine at that time. Valdemar Chidondo served as Chief of Staff in the government of UNITA, pro-Western rebels, during the Angolan Civil War (1975–2002). Jonas Savimbi, leader of UNITA, allegedly ordered Chidondo's assassination.

Savimbi's successor as president of UNITA was Isaías Samakuva. Following Savimbi's death, UNITA abandoned armed struggle and participated in electoral politics. The party won 51 out of 220 seats in the 2017 parliamentary election. Samakuva resigned as party leader in November 2019, being replaced by Adalberto Costa Júnior.