"Red Nails" is the last of the stories featuring Conan the Cimmerian written by American author Robert E. Howard. A novella, it was originally serialized in Weird Tales magazine from July to October 1936, the months after Howard's suicide. It is set in the fictional Hyborian Age and concerns Conan entering a lost city whose degenerate inhabitants are entangled in a murderous blood feud. Due to its dark themes of decay and death, the story is considered a classic of Conan lore while also cited by Howard scholars as one of his best tales.

Conan the Barbarian is a fictional sword and sorcery hero who originated in pulp magazines and has since been adapted to books, comics, films, television programs, video games, and role-playing games. Robert E. Howard created the character in 1932 for a series of fantasy stories published in Weird Tales magazine.