Accidental
Accidental may refer to:

Accidental (music), a symbol which changes the pitch of a note
Accidental (album), by Fred Frith
Accidental (biology), a biological phenomenon more commonly known as vagrancy
The Accidental, a 2005 novel by Ali Smith
The Accidental (band), a UK folk band
Accidental property, a philosophical term

See also
Accidence (or inflection), a modification of a word to express different grammatical categories
Accident (disambiguation)
Adventitious, which is closely related to "accidental" as used in philosophy and in biology
Random, which often is used incorrectly where accidental or adventitious would be appropriate