Accidental may refer to:

Look up accidental in Wiktionary, the free dictionary.

• 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

• 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

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