 Moral arguments for God’s existence form a diverse family of arguments that reason from some feature of morality or the moral life to the existence of God, usually understood as a morally good creator of the universe. Moral arguments are both important and interesting. They are interesting because evaluating their soundness requires attention to practically every important philosophical issue dealt with in metaethics. They are important because of their prominence in popular apologetic arguments for religious belief. Evidence for this can be found in the amazing popularity of C. S. Lewis’s Mere Christianity (1952), which is almost certainly the best-selling book of apologetics in the twentieth century, and which begins with a moral argument for God’s existence. Many ordinary people regard religion as in some way providing a basis or foundation for morality. This fact might seem to favor religious arguments for morality rather than moral arguments for religious belief, but if someone believes that morality is in some way “objective” or “real,” and that this moral reality requires explanation, moral arguments for God’s reality naturally suggest themselves. The apparent connection between morality and religion appears to many people to support the claim that moral truths require a religious foundation, or can best be explained by God’s existence, or some qualities or actions of God.