National Commission on the Disappearance of Persons (Spanish: Comisión Nacional sobre la Desaparición de Personas, CONADEP) was an Argentine organization created by President Raúl Alfonsín on 15 December 1983, shortly after his inauguration, to investigate the fate of the desaparecidos (victims of forced disappearance) and other human rights violations (see: Dirty War) performed during the military dictatorship known as the National Reorganization Process between 1976 and 1983.

The research of the investigation commission was documented in the Nunca Más (Never Again) report, which was a complete summary published as an official report in Spanish, and delivered to Alfonsín on 20 September 1984, which opened the doors to the trial of the military juntas of the dictatorship. CONADEP recorded the forced disappearance of 8,961 persons from 1976 to 1983, although it noted that the actual number could be higher (estimates by human rights organizations usually place it at 30,000 persons). The report also stated that about 600 people were "disappeared" and 458 were assassinated (by death squads such as the Argentine Anticommunist Alliance) during the Peronist governments from 1973 to 1976.