This seventh volume in our series Readings in Moral Theology explores the theory of natural law which occupies a central place in the tradition of Catholic moral theology. Complications arise, how-ever, because natural law overlaps with three topics already discussed in this series - the formation of moral norms, the distinctiveness of Christian ethics, and Catholic social teaching. In addition, natural law remains an important topic in law and jurisprudence, but such considerations lie beyond the scope of this volume.