The Halloween Massacre was a purge of UNITA party members and supporters carried out by Angola's ruling MPLA from October 30 to November 1, 1992, in Luanda, Angola. The unrest occurred as a result of the breakdown of the Bicesse Accords, on account of alleged voter fraud in the 1992 Angolan general elections, resulting in renewed military tensions, assassinations of public figures, and acts of terrorism. Thousands of UNITA supporters are estimated to have been murdered.

The National Union for the Total Independence of Angola 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 the 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.