The Slithering Shadow (also known as Xuthal of the Dusk) is one of the original short stories starring the fictional sword and sorcery hero Conan the Cimmerian, written by American author Robert E. Howard and first published in the Weird Tales magazine. It is set in the pseudo-historical Hyborian Age and concerns Conan finding a lost city in a remote desert and encountering therein a Lovecraftian-esque demon known as Thog.