The El Mozote massacre took place in and around the village of El Mozote, in Morazán Department, El Salvador, on December 11 and 12, 1981, when the Salvadoran Army killed more than 811 civilians during the Salvadoran Civil War. The army had arrived in the village on the 10th, following clashes with guerrillas in the area. The Salvadoran Army's Atlacatl Battalion was responsible for the massacre.

In December 2011, the government of El Salvador apologized for the massacre, the largest in Latin America in modern times.