Codex Marchalianus

Codex Marchalianus designated by siglum Q is a 6th-century Greek manuscript copy of the Greek version of the Hebrew Bible (Tanakh or Old Testament) known as the Septuagint. The text was written on vellum in uncial letters. Palaeographically it has been assigned to the 6th century. Marginal annotations were later added to the copy of the Scripture text, the early ones being of importance for a study of the history of the Septuagint.

Its name was derived from a former owner, René Marchal.