This article reassesses the contribution of the late Renaissance scholar and teacher Petrus Victorius (Pier Vettori) to the reconstruction of the text of Aristotle's Eudemian Ethics, which has come down to us in what is often a highly corrupt form. It proposes an interpretation of certain abbreviations in the marginalia in one of Victorius's copies of the Aldine Eudemian Ethics which reveals them as recommending readings rather than recording them; it proposes that many more of those readings constitute his own conjectures than previously thought. The article goes on to suggest why Victorius never produced an edition of the Eudemian Ethics as he did of other Aristotelian works, despite returning repeatedly, over much of his life, to the task of improving this particular text. Victorius is revealed nonetheless as a highly creative—but also highly disciplined—textual critic, at least the equal of his nineteenth- and twentieth-century successors.