Enrique Haroldo Gorriarán Merlo (18 October 1941 – 22 September 2006) was an Argentine guerrilla insurgency leader, born in San Nicolás de los Arroyos, Buenos Aires Province. His family was affiliated with the Radical Civic Union, but at the age of 27 Gorriarán Merlo joined the Trotskyist Workers Revolutionary Party (PRT), and then cofounded its armed wing, the People's Revolutionary Army (ERP). He continued to be a leader of the PRT and the ERP through to the beginning of the Argentine Dirty War, spanning the governments of Héctor José Cámpora (1973), Juan Perón, and Isabel Martínez de Perón, the last of which was cut short by the coup that started the National Reorganization Process (1976).