The Apocrypha 

We accept a 66-book canon. Catholics accept all 66 of those books plus the Old Testament Apocrypha.  The apocryphal books are: 1 & 2 Esdras, Tobit, Judith, the Rest of Esther, the Wisdom of Solomon, Ecclesiasticus, Baruch (including the Epistle of Jeremiah), the Song of the Three Holy children, Susanna, Bel and the Dragon, the Prayer of Manasseh and 1 & 2 Maccabees.

The writers of the Apocrypha do not claim the same kind of authority as the Old Testament writings, and while New Testament authors quote parts of the Old Testament as being divinely authoritative 295 times, not once is anything from the Apocrypha quoted. (There are some non-biblical sources that are cited by way of illustration, but never with any statement about divine authority, such as, “God said…”).  No apocryphal books appear in the Hebrew Old Testament (although they do show up in the Greek translation). The Jews never accepted them as Scripture, and the earliest Christian evidence is decidedly against viewing the Apocrypha as Scripture.  Support for the Apocrypha increased only later in Church history, but never enjoyed widespread acceptance by the Church. There is no hint of Jesus or the Apostles disagreeing with the Jewish position on the Old Testament Canon not including the Apocrypha. 

Finally, the Apocrypha does not bear the marks of divine authorship. There are significant doctrinal and historical errors.

E.J. Young notes: 
There are no marks in these books which would attest a divine origin…both Judith and Tobit contain historical, Chronological and geographical errors. The books justify falsehood and deception and make salvation to depend upon works of merit…Ecclesiasticus and the Wisdom of Solomon inculcate a morality based upon expediency.  Wisdom teaches the creation of the world out of pre-existent matter.  Ecclesiasticus teaches that the giving of alms makes atonement for sin.  In Baruch it is said that God hears the prayers of the dead, and in 1 Maccabees there are historical and geographical errors.  

The fact that Jesus regarded the Jewish Old Testament (which did not include the Apocrypha) as God’s Word should settle the issue of the Old Testament canon.