Augustine’s account of evil has influenced most later thinkers in the western tradition. He argues for three central theses: (a) evil is the lack of some positive feature that ought to be present, a “privation”; (b) moral evil comes about solely from the less-than-perfect free choices of rational beings; and (c) all suffering—which need not be the result of moral evil but perhaps of natural processes or events—is morally justified. As part of his defense of (b), Augustine states in full generality the problem of evil (namely, how can there be any genuine evil in a world presided over by an omnipotent and benevolent deity?), and articulates in reply the free will defense. The arguments Augustine offers in support of the free will defense, and in favor of (a)–(c), are set forth and their implications assessed. The upshot is a coherent account of evil that dominated the debates for many centuries to come.