The Leningrad Codex (or Codex Leningradensis) is the oldest complete manuscript of the Hebrew Bible in Hebrew, using the masoretic text and Tiberian vocalization. It is dated 1008 CE (or possibly 1009) according to its colophon. The Aleppo Codex, against which the Leningrad Codex was corrected, is several decades older, but parts of it have been missing since 1947, making the Leningrad Codex the oldest complete codex of the Tiberian mesorah that has survived intact to this day.
In modern times, the Leningrad Codex is significant as the Hebrew text reproduced in Biblia Hebraica (1937) and Biblia Hebraica Stuttgartensia (1977). It also serves scholars as a primary source for the recovery of details in the missing parts of the Aleppo Codex.
The biblical text as found in the codex contains the Hebrew letter-text along with Tiberian vowels and cantillation signs. In addition, there are masoretic notes in the margins. There are also various technical supplements dealing with textual and linguistic details, many of which are painted in geometrical forms. The codex is written on parchment and bound in leather.
The Leningrad Codex, in extraordinarily pristine condition after a millennium, also provides an example of medieval Jewish art. Sixteen of the pages contain decorative geometric patterns that illuminate passages from the text. The carpet page shows a star with the names of the scribes on the edges and a blessing written in the middle.
The order of the books in the Leningrad Codex follows the Tiberian textual tradition, which is also that of the later tradition of Sephardic biblical manuscripts. This order for the books differs markedly from that of most printed Hebrew bibles for the books of the Ketuvim. In the Leningrad Codex, the order of the Ketuvim is: Chronicles, Psalms, Job, Proverbs, Ruth, Song of Songs, Ecclesiastes, Lamentations, Esther, Daniel, Ezra-Nehemiah. The full order of the books is given below.