In his commentary on the Nicomachean Ethics, Averroes addressed the passage where Aristotle distinguishes between things that are just by nature and those that are under the law (V 7 1134b18-1135a5). His commentary is particularly short, but it poses some important difficulties, as his allusion to a naturale legale just, that, according to Leo Strauss, would be simply positive law that has general acceptation. This article seeks to characterize the just by nature and the just under positive law on Averroes commentary and show the extent of the variation in the criteria of positive justice.