Léonie Duquet

Marie Léonie Duquet, S.M.E. (9 April 1916 – December 1977) was one of two French Religious Sisters, members of the Sisters of the Foreign Missions based in Seysses, France, who were arrested in December 1977 in Buenos Aires, Argentina, and "disappeared". Alice Domon, the other French Sister working with Duquet, disappeared a few days later. They are believed to have been murdered by the military regime of Argentine President Jorge Rafael Videla during the Dirty War.

Duquet and Domon had been working in poor neighborhoods of Buenos Aires in the 1970s and supported the Mothers of the Plaza de Mayo, founded in 1977. Despite repeated efforts by France to trace the two Sisters, the Argentine military dictatorship was unresponsive. In 1990 a French court in Paris tried Argentine Captain Alfredo Astiz, known to have arrested Duquet and believed implicated in the "disappearance" of Domon, for kidnapping the two Sisters. He was convicted and sentenced to life imprisonment in absentia. In Argentina at the time, he and other military and security officers were shielded from prosecution by Pardon Laws passed in 1986 and 1987. These were repealed in 2003 and ruled unconstitutional in 2005, and the government re-opened prosecution of war crimes.

In July 2005 several bodies were found in a mass grave in General Lavalle Cemetery, 400 kilometers south of Buenos Aires. Forensic DNA testing in August identified one as Duquet's. DNA testing revealed that within the same grave were the remains of the three "disappeared" Argentine women, founders of the Mothers of the Plaza de Mayo, who had also been missing since December 1977. To date, the remains of Domon have not been found. Since the confirmation of Duquet's murder, France has been seeking extradition of Astiz; in 2005 he was being detained in Argentina after being indicted on charges of kidnapping and torture.