Augusto Roa Bastos (June 13, 1917 – April 26, 2005) was a Paraguayan novelist and short story writer. As a teenager he fought in the Chaco War between Paraguay and Bolivia, and he later worked as a journalist, screenwriter and professor.

He is best known for his complex novel Yo el Supremo (I, the Supreme) and for winning the Premio Miguel de Cervantes in 1989, Spanish literature's most prestigious prize.

Most of Roa Bastos' work was written in exile, but this did not deter him from fiercely tackling Paraguayan social and historical issues in his work. Writing in a Spanish that was at times heavily augmented by Guaraní words (the major Paraguayan indigenous language), Roa Bastos incorporated Paraguayan myths and symbols into a Baroque style known as magical realism. He is considered a late-comer to the Latin American Boom literary movement. Roa Bastos' canon includes the novels Hijo de hombre (1960; Son of Man) and El fiscal (1993; The Prosecutor), as well as numerous other novels, short stories, poems, and screenplays.

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