The Letter of Jeremiah, also known as the Epistle of Jeremiah, is a deuterocanonical book of the Old Testament; this letter is attributed to Jeremiah and addressed to the Jews who were about to be carried away as captives to Babylon by Nebuchadnezzar. It is included in Roman Catholic Bibles as the final chapter of the Book of Baruch. It is also included in Orthodox Bibles as a separate book, as well as in the Apocrypha of the Authorized Version.

The deuterocanonical books, meaning "Of, pertaining to, or constituting a second canon," collectively known as the Deuterocanon (DC), are certain books and passages considered to be canonical books of the Old Testament by the Catholic Church, the Eastern Orthodox Church, the Oriental Orthodox Churches and the Assyrian Church of the East, but which modern Jews and Protestants regard as apocrypha.