The Aramaic original New Testament theory is the belief that the Christian New Testament was originally written in Aramaic.

There are six versions of the New Testament in Aramaic languages:

1. the Vetus Syra (Old Syriac), a translation from Greek into early Classical Syriac, containing most—but not all—of the text of the 4 Gospels, and represented in the Curetonian Gospels and the Sinaitic Palimpsest
2. the Christian Palestinian Aramaic Lectionary fragments represented in such manuscripts as Codex Climaci Rescriptus, Codex Sinaiticus Rescriptus, and later lectionary codices (Vatican sir. 19 [A]; St Catherine’s Monastery B, C, D)
3. the Classical Syriac Peshitta, a rendering in Aramaic of the Hebrew (and some Aramaic, e.g. in Daniel and Ezra) Old Testament, plus the New Testament purportedly in its original Aramaic, and still the standard in most Syriac churches
4. the Harklean, a strictly literal translation by Thomas of Harqel into Classical Syriac from Greek
5. the Assyrian Modern Version, a new translation into Assyrian Neo-Aramaic from the Greek published in 1997 and mainly in use among Protestants
6. and a number of other scattered versions in various dialects

The traditional New Testament of the Peshitta has 22 books, lacking the Second Epistle of John, the Third Epistle of John, the Second Epistle of Peter, the Epistle of Jude and the Book of Revelation, which are books of the Antilegomena. Closure of the Church of the East's New Testament Canon occurred before the 'Western Five' books could be incorporated. Its Gospels text also lacks the verses known as Jesus and the woman taken in adultery (John 7:53–8:11) and Luke 22:17–18, but does have the 'long ending of Mark.'