The Spacing Guild is an organization in Frank Herbert's science fiction Dune universe that possesses a monopoly on interstellar travel and banking. Guild Navigators (alternately Guildsmen or Steersmen) use the drug melange (also called "the spice") to achieve limited prescience, a form of precognition that allows them to successfully navigate "folded space" and safely guide enormous starships called heighliners across interstellar space instantaneously.