The Mothers of the Plaza de Mayo is an Argentine human rights association formed in response to the National Reorganization Process, the military dictatorship by Jorge Rafael Videla, with the goal of finding the desaparecidos, initially, and then determining the culprits of crimes against humanity to promote their trial and sentencing.

The Mothers began demonstrating in the Plaza de Mayo, the public square located in front of the Casa Rosada presidential palace, in the city of Buenos Aires, on April 30, 1977, to petition for the alive reappearance of their disappeared children. Originally, they would remain there seated, but by declaring state of emergency, police expelled them from the public square.