A referendum on whether Augusto Pinochet, the head of a military dictatorship, should become president for eight years under resumed civilian rule was held in Chile on October 5, 1988. The "No" side won with 56% of the vote, marking the end of Pinochet's 16+1⁄2-year rule. Democratic elections were held in 1989, leading to the establishment of a new government in 1990.

Augusto José Ramón Pinochet Ugarte was a Chilean army officer and military dictator who ruled Chile from 1973 to 1990. He was the leader of the military junta from 1973 to 1981, and was declared President of the Republic by the junta in 1974 and thus became the dictator of Chile, and from 1981 to 1990 as de jure president after a new constitution which confirmed him in the office was approved by a referendum in 1980. His time in office remains the longest of any Chilean ruler.