This chapter explains the many ways in which individual happiness and common happiness are related to Aquinas’s account of law, both generally and with respect to some particular laws. The chapter begins by arguing that, by its very nature, every genuine law orders the things under it to the common happiness of some community or other. It then argues that, according to Aquinas, moral laws order us to common happiness by outlining universal and absolute rules that must be followed in order to fully realize common happiness. Unlike many have thought, then, Aquinas holds that our moral obligations are fundamentally determined by facts about which norms must be followed in order to realize common happiness, not individual happiness. That is the second element of his Holistic Eudaimonism. On the other hand, when it comes to civil laws, the chapter argues that Aquinas advocates a kind of top-down, restricted rule-consequentialism with common happiness as its goal.