Adelina Ethel Dematti de Alaye (June 5, 1927 – May 24, 2016) was an Argentine human rights activist who co-founded the Mothers of the Plaza de Mayo, an organization of mothers whose children disappeared during the Dirty War of the 1970s and early 1980s.

[1][2] In addition to her work with the Mothers of the Plaza de Mayo, Dematti was also active within the Permanent Assembly for Human Rights (APDH).

[2] Her 21-year-old son, Carlos Esteban, was kidnapped on May 5, 1977, while riding his bicycle in the Ensenada neighborhood of Buenos Aires during the Dirty War.

In 2009, the National University of La Plata awarded Dematti an honorary doctorate for her activism on behalf of human rights.

[1][2] Adelina Dematti de Alaye died in La Plata, Buenos Aires Province, on May 24, 2016, at the age of 88.