Several commentators make the claim that Augustine is not a systematic thinker. The purpose of this thesis is to refute that claim in one specific area of Augustine's thought, the metaphysical foundations underlying his solutions to the problem of evil. Through an exegetical examination of various works in which Augustine writes on evil, I show that his solutions for both natural and moral evil rely on a coherent metaphysical system, conceived of and expounded upon within a Platonically influenced Christian context.