Juan Manuel Guillermo Contreras Sepúlveda (4 May 1929 – 7 August 2015) was a Chilean military officer and the former head of DINA, Chile's secret police during the dictatorship of General Augusto Pinochet. As head of DINA he was the most powerful and feared man in the country, after Pinochet. Until his death in August 2015 of multiple organ failure, he was serving 58 sentences totaling 498 years in prison for kidnapping, forced disappearance and assassination.