Commentaria in Aristotelem Graeca [edita consilio et auctoritate academiae litterarum Regiae Borussicae] (CAG) is the standard collection of extant ancient Greek commentaries on Aristotle. The 23 volumes in the series were released between the years 1882 and 1909 by the publisher Reimer. Many of these commentaries have since been translated into English by the Ancient commentators project.