The Dirty War (Spanish: Guerra sucia) is the name used by the military junta or civic-military dictatorship of Argentina (Spanish: dictadura cívico-militar de Argentina) for the period of state terrorism in Argentina from 1974 to 1983 as a part of Operation Condor, during which military and security forces and death squads in the form of the Argentine Anticommunist Alliance (AAA, or Triple A) hunted down any political dissidents and anyone believed to be associated with socialism, left-wing Peronism, or the Montoneros movement.

It is estimated that between 9,000 and 30,000 people were killed or disappeared, many of whom were impossible to formally document due to the nature of state terrorism. The primary target, like in many other South American countries participating in Operation Condor, were communist guerrillas and sympathisers, but the target of Operation Condor also included students, militants, trade unionists, writers, journalists, artists and any citizens suspected of being left-wing activists. The disappeared included those thought to be a political or ideological threat to the junta, even vaguely, or those seen as antithetical to the neoliberal economic policies dictated by Operation Condor. All were killed in an attempt by the junta to silence social and political opposition.

By the 1980s, economic collapse, public discontent, and the disastrous handling of the Falklands War, resulted in the end of the Junta and the restoration of democracy in Argentina, effectively ending the Dirty War. Many members of the junta are currently in prison for crimes against humanity and genocide. The Dirty War left a profound impact on Argentine culture, which is still felt to this day.