apocrypha

thumb|right|upright=1.4|The apocryphal letter of Sultan Mehmed II to the Pope (), published by [[Nicolae Iorga. Series 4: 1453–1476, Paris; Bucharest, 1915, pages 126–127]] Apocrypha () are biblical or related writings not forming part of the accepted canon of scripture, some of which might be of doubtful authorship or authenticity. In Christianity, the word apocryphal (ἀπόκρυφος) was first applied to writings that were to be read privately rather than in the public context of church services. Apocrypha were edifying Christian works that were not always initially included as canonical scripture.

The adjective "apocryphal", meaning of doubtful authenticity, mythical, fictional, is recorded from the late 16th century, then taking on the popular meaning of "false," "spurious," "bad," or "heretical." It may be used for any book which might have scriptural claims but which does not appear in the canon accepted by the author. A related term for both canon and non-canonical texts whose authorship seems incorrect is pseudepigrapha, a term that means "false attribution".