The canon of the Protestant Bible totals 66 books—39 Old Testament (OT) and 27 New Testament (NT); the Catholic Bible numbers 73 books (46 OT, 27 NT), and Greek and Russian Orthodox, 79 (52 OT, 27 NT) (Ethiopian Orthodox, 81—54 OT, 27 NT).

These books—Tobit, Judith, more chapters of Esther and Daniel, the Books of Maccabees, the Book of the Wisdom of Solomon, the Book of Sirach, the Prophecy of Baruch, and the Prayer of Manasseh—are considered by the Orthodox to be fully part of the Old testament because they are part of the longer canon that was accepted from the beginning by the early Church.

The Orthodox Tewahedo biblical canon is a version of the Christian Bible used in the two Oriental Orthodox Churches of the Ethiopian and Eritrean traditions: the Ethiopian Orthodox Tewahedo Church and the Eritrean Orthodox Tewahedo Church. At 81 books, it is the largest and most diverse biblical canon in traditional Christendom.