Otherness
Otherness may refer to:

The state of the Other, in philosophy
Alterity or otherness, the philosophical principle of exchanging one's perspective for that of the "other"
Otherness of childhood

As a proper noun
Otherness (book), an anthology of science fiction stories by David Brin
Otherness (F. Paul Wilson), a malevolent force in several novels by F. Paul Wilson
Otherness (EP), a 1995 EP by Scottish band Cocteau Twins
Otherness (Kindness album), a 2014 album by English musician Kindness
Otherness (Alexisonfire album), a 2022 album by Canadian band Alexisonfire