The military dictatorship of Chile (Spanish: dictadura militar de Chile) was an authoritarian military government that ruled Chile between 1973 and 1990. The dictatorship was established after the democratically elected government of Salvador Allende was overthrown by a CIA-backed coup d'état on 11 September 1973. The dictatorship was headed by a military junta presided by General Augusto Pinochet. The perceived breakdown of democracy and the economic crisis that took place during Allende's presidency were justifications used by the military to seize power. The dictatorship presented its mission as a "national reconstruction."

The regime was characterized by the systematic suppression of political parties and the persecution of dissidents to an extent that was unprecedented in the history of Chile. Over-all, the regime left over 3,000 dead or missing, tortured thousands of prisoners, and forced 200,000 Chileans into exile. The dictatorship shaped much of modern Chile's political and economic life. Two years after its ascension it implemented radical neoliberal economic reforms in sharp contrast to Allende's leftist policies, advised by a team of free-market economists educated in American universities known as the Chicago Boys. Later, in 1980, the regime replaced the Constitution of 1925 with a new one crafted by regime collaborators. Pinochet's plans to remain in power were thwarted in 1988 when the regime admitted defeat in a referendum that opened the way for democracy to be reestablished in 1990. However, the regime took great care to ensure that the political and economic system it had created would remain unmodified. The regime also arranged for the military to be out of civilian control after the end of dictatorship.

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