This work is the first English translation of Scotus’ commentary on Aristotle’s Quaestiones super Praedicamenta. Although there are numerous Latin commentaries on Aristotle’s Categories, Scotus’ Questions is one of the few commentaries on the Categories written in the thirteenth century covering all of Aristotle’s text, including the often neglected post-praedicamenta, and the only complete Latin commentary available in English. Moreover, unlike many of the commentaries, Scotus’ text is one of the last commentaries to be written before the nominalist reduction of the categories to substance and quality. The question format allows Scotus a great deal of liberty to discuss the categories in detail, as well as matters that are only remotely raised by the text.