Codex Seidelianus I, also known as Codex Wolfii A and Codex Harleianus, is a Greek uncial manuscript of the Gospels written on parchment. It is designated by the siglum Ge or 011 in the Gregory-Aland numbering of New Testament manuscripts, and ε 87 in the von Soden numbering of New Testament manuscripts. Using the study of comparative writing styles (palaeography), it has been assigned to the 9th or 10th century. The manuscript has some missing portions.