Beatriz Arnut (1892 – 1958), was a Portuguese writer, poet, civil servant and defender of women's rights.

She was the daughter of Cândida Amália Arnut, a descendant of José Maria Arnaud, originally Giuseppe Maria Arnaud, an Italian industrialist involved with the production and sale of silk, who in the 18th century left Piedmont in Italy with his family to settle in Portugal to manage the Real Filatório de Chacim (Royal silk weaving factory of Chacim).

[1][2][3] Disillusioned by the establishment of the authoritarian Estado Novo government in 1933, Arnut joined the feminist Conselho Nacional das Mulheres Portuguesas (National Council of Portuguese Women - CNMP) at the invitation of writer and journalist Sara Beirão.

[1][4] Determined to support young Portuguese women who wanted to do advanced studies, Arnut instituted the Trás-os-Montes Prize, which gave scholarships to university students from the region from which she came.

[1] Arnut wrote for several Portuguese newspapers and magazines, including Diário de Notícias, Diário de Lisboa, Correio da Noite and Lisbon's Municipal Magazine,[5] as well as the Brazilian Revista Feminina.