Codex Tischendorfianus III – designated by siglum Λ or 039 (in the Gregory-Aland numbering), ε 77 (von Soden) – is a Greek uncial manuscript of the Gospels on parchment. Palaeographically it has been assigned to the 9th or 10th century.

It is one of very few uncial manuscripts of the New Testament with full marginal apparatus.

The manuscript was brought from the East by Constantin von Tischendorf (hence the name of the codex), who also examined, described, and was the first scholar to collate its text. The manuscript was also examined by scholars like Samuel Prideaux Tregelles, Ernst von Dobschütz, and Gächler. It is housed in the Bodleian Library.

The codex contains the complete text of the Gospel of Luke and the Gospel of John on 157 parchment leaves (21 centimetres (8.3 in) by 16.5 centimetres (6.5 in)). The leaves are arranged in quarto, that is four leaves folded in quires. The text is written in two columns per page, 23 lines per page. There are no spaces between letters, and the words are not separate but written in scriptio continua. The uncial letters are small, not beautiful and slanting. The letters are characterized by Slavonic uncials. The writing is similar to that of Codex Cyprius.

It has breathings and accents, diaeresis, there is no interrogative sign. The errors of iotacism are rare, it has iota adscriptum. All errors are infrequent and it has good grammar.

It has the ornamented headpieces before each Gospel and the decorated initial letters.

Before Gospel of Luke it contains subscription to Mark.

The nomina sacra are written in an abbreviated way; all abbreviations are written in a usual way. In the end of each Gospel stands the Jerusalem Colophon.