Nothing in human affairs is worthy of great anxiety. -PlatoHow much should I give to charity? Is it okay for me to break this promise? As an advocate of women's rights, can I vote for the pro-life candidate? When we face difficult moral decisions like these, we feel a distinctive unease: we must make a choice but we are unsure what the correct thing to do is. Yet despite the pervasiveness of this phenomenon, surprisingly little work has been done to either characterize this emotion-this moral anxiety-or explain the role it plays in moral decision making. That's a mistake. Given that moral anxiety is a pervasive feature of our lives, it is important that we understand what it is. Moreover, and more importantly, given the many ways in which emotions can inform and distort our reasoning, it is also important to understand the role that moral anxiety plays in moral decision making.In what follows, I will argue that moral anxiety is central to good moral decision making and agency-it's an emotion that we ought to cultivate. This claim is striking on its own. But it also upends the familiar picture, one found among philosophers and folk alike, of anxiety as an inherently destructive emotion: the anxious person is someone consumed-paralyzed-by intense anxiety. What could be valuable in that? To make my case, I begin by developing a model of moral anxiety that builds from work on anxiety in general and social anxiety in particular ( § §1-3). The resulting account reveals moral anxiety to be an emotion that (i) we experience when we are uncertain about the correctness of a moral decision that we are contemplating or have made, and that (ii) prompts epistemic behaviors like deliberation and information gathering that are aimed at resolving our underlying uncertainty. With this model in hand, I then argue that moral anxiety is an emotion that is particularly well-suited to engage the capacities that are essential to good moral decision making and agency-deliberation, reflection, and