Beatriz Guido (13 December 1924 – 4 March 1988) was an Argentine novelist and screenwriter.
Guido was born in Rosario, Santa Fe Province, the daughter of architect Ángel Guido (renowned as the creator of the National Flag Memorial) and of Uruguayan actress Berta Eirin. She studied at the Faculty of Philosophy and Letters of the University of Buenos Aires.
She wrote her first novel, La casa del ángel, in 1954. She also wrote a short story named Usurpacion. Because of her outspoken anti-Peronism, she was branded a "right-wing writer" and a "false aristocrat" by the government of Juan Perón. In 1959 she married film director and screenwriter Leopoldo Torre Nilsson. She started working with her husband, who took several of her works to the screen.
In 1984 she won the Konex Merit Diploma on Letters. That year she was appointed cultural attaché of the Argentine Embassy in Spain. She died of a heart attack in Madrid four years later, at the age of 63.