Parallel universe may refer to:
Science Many-worlds interpretation of quantum mechanics, which implies the existence of parallel universes Multiverse, the sum of all universes, e.g. everything that exists
Philosophy Possible world, a construct in metaphysics to bring rigor to talk of logical possibility Modal realism, an account of possible worlds according to which they are all just as real as the actual world Extended modal realism, the view that all worlds, possible as well as impossible, are as real as the actual world
Arts and media Parallel universes in fiction, a hypothetical self-contained plane of existence, co-existing with one's own Alternate history, a genre of fiction in which historical events differ from reality Alternative universe (fan fiction), fiction by fan authors that departs from the fictional universe of the source work
Literature, film, and television "Parallel Universe" (Red Dwarf), a 1988 TV episode Parallel Universes (film), a 2001 British TV documentary Mirror Universe (Star Trek), a fictional parallel universe in the Star Trek franchise
Music Parallel Universe (4hero album) or the title song, 1994 Parallel Universe (Garnet Crow album), 2010 Parallel Universe, an album by Plain White T's, 2018 "Parallel Universe" (song), by the Red Hot Chili Peppers, 1999 Parallel Dimensions (album), by Perseo Miranda, 2008
See also Metaverse, a collective virtual shared space Alternate reality (disambiguation) Multiverse (disambiguation) Otherworld Parallel World (disambiguation)