This is a list of fictional universes, organized by genre and by sub-genre. The term universe can be misleading, since some of them are supposed to occur in our own world, but in a fictional future (science fiction) or past (Hyborian Age) timeline. Because one author's universe may produce stories in different genres, it may be listed in more than one place.
Stories taking place on an Earth that varies from non-fictional Earth in a few details.
Fictional universes designed to closely mimic the real world, but are nonetheless self-contained, consistent locations in their own right.
Barsetshire, fictional English county in Anthony Trollope's 19th century novels; also the setting for a series of novels by Angela Thirkell that span the period from the 1920s through the 1950s