Olivia Rossetti Agresti (September 30, 1875 – November 6, 1960) was a British activist, author, editor, and interpreter. A member of one of England's most prominent artistic and literary families, her unconventional political trajectory began with anarchism, continued with the League of Nations, and ended with Italian fascism. Her involvement with the latter led to an important correspondence and friendship with Ezra Pound, who mentions her twice in his Cantos.
Olivia Rossetti Agresti was born in London to William Michael Rossetti, one of the seven founding members of the Pre-Raphaelite Brotherhood and the editor of its literary magazine The Germ. A granddaughter of Gabriele Rossetti and Ford Madox Brown, she was hence a niece of Maria Francesca Rossetti, Dante Gabriel Rossetti and Christina Rossetti, as well as a first cousin of Ford Madox Ford.
While still in their girlhood, Olivia and her sister, the future Helen Rossetti Angeli (1879-1969), began publishing an anarchist journal, The Torch, in the basement of their family home.