Maria Alda Nogueira (1923–1988) was a communist and feminist activist who opposed Portugal's Estado Novo regime and spent nine years as a political prisoner.

After the overthrow of the Estado Novo she became a parliamentary deputy, serving in the National Assembly for a decade.

She took part in the "Exhibition of Books Written by Women", organized by the CNMP in January 1947, making a presentation on "A woman and Science".

She ended up in Belgium, where she was on 25 April 1974, the day of the Carnation Revolution that saw the overthrow of the Estado Novo.

Set up originally in 1968 to oppose the Estado Novo, after the Carnation Revolution the MDM refocussed to address women's rights.

She wrote for the Jornal do Fundão newspaper and in the magazines Modas e Bordados and Os Nossos Filhos.