Doña María Tomasa Palafox y Portocarrero, Marquise of Villafranca and Duchess of Medina Sidonia (1780–1835), was a Spanish noblewoman. She was a patron and muse of the painter Francisco de Goya y Lucientes and the wife of Francisco de Borja Álvarez de Toledo, 12th Marquis of Villafranca.