Uncial 0151 (in the Gregory-Aland numbering), X21 (in the Soden numbering),[1] is a Greek uncial manuscript of the New Testament.
[2] Epistle to the Hebrews is placed between 2 Thessalonians and 1 Timothy.
The Greek text of this codex is a representative of the Byzantine text-type.
Aland placed it in Category V.[2] Textually it is close to Codex Mosquensis I.
[1] The codex currently is located at the Monastery of Saint John the Theologian (Ms. 62), at Patmos.