Silo is a dystopian series of post-apocalyptic science fiction books by American writer Hugh Howey. The series started in 2011 with the short story "Wool", which was later published together with four sequel novellas as a novel with the same name. Along with Wool, the series consists of Shift, Dust, and three short stories. The series has also been adapted as a graphic novel and a television series on Apple TV+.