Deolinda Lopes Vieira (8 July 1888 – 6 June 1993) was a primary school teacher as well as an anarcho-syndicalist activist and a feminist, who played an important role in Portugal's Conselho Nacional das Mulheres Portuguesas (National Council of Portuguese Women - CNMP).

She was the daughter of Maria Claudina Lopes, an unmarried domestic servant, who came from Algarve, and José Gonçalves Vieira, a travelling salesman, who only formally acknowledged his paternity in 1894.

She completed her primary school course at the Escola Normal Primária de Lisboa, which at that time was a progressive institution that aimed to bring about pedagogical and social reforms.

[1][2] At a young age, Lopes Vieira began to get involved in various political and civil rights causes and became an enthusiastic member of the Republican Party, which aimed to overthrow the Portuguese monarchy.

In 1923, she became a freemason, joining a branch of the French Ordre maçonnique mixte international - le Droit humain, and became one of the founders of the Humanity Masonic Lodge in Lisbon in 1923.

She also joined the Conselho Nacional das Mulheres Portuguesas (National Council of Portuguese Women - CNMP), remaining a member until its forced closure in 1947.