 Gratitude is the proper or called-for response in a beneficiary to benefits or beneficence from a benefactor. It is a topic of interest in normative ethics, applied ethics, moral psychology, and political philosophy. Despite its ubiquity in everyday life, there is substantive disagreement among philosophers over the nature of gratitude and its relationship to other philosophical concepts. The sections of this article address five areas of debate about what gratitude is, when gratitude is called for, and how the answers to those questions bear on other topics in moral philosophy and philosophy generally.