Otherland is a series of four science fiction (cyberpunk) novels written by Tad Williams. The story is set in the mid-to-late 21st century (Some hints to a character's age shows that the story takes place in the 2070's) where technology has advanced somewhat from the modern day. The most notable advancement has been the development of the ability for people to attach themselves fully to a computer via a nerve interface in order to experience an online world, called simply “the net”, as virtually real. Tad Williams weaves an intricate plot spanning four thick volumes and creates a picture of a future society where virtual worlds are fully integrated into everyday life.

His proposed ability to immerse oneself fully in a simulation gives him a great deal of artistic freedom, and the story winds through alternate interpretations of many classical literary works such as Through the Looking Glass, The Odyssey, The War of the Worlds, and The Wizard of Oz, which are in the book available as entertainment simulations.