Book of Baruch, ancient text purportedly written by Baruch, secretary and friend of Jeremiah, the Old Testament prophet. The text is still extant in Greek and in several translations from Greek into Latin, Syriac, Coptic, Ethiopic, and other languages. The Book of Baruch is apocryphal to the Hebrew and Protestant canons but was incorporated in the Septuagint and was included in the Old Testament for Roman Catholics. The work is a compilation of several authors and is the only work among the apocrypha that was consciously modeled after the prophetic writings of the Old Testament.