Advice, defined as a recommendation for action in response to a problem, is a common form of interpersonal support and influence. Indeed, the advice we give and receive from others can be highly consequential, not only affecting us as recipients and advisors but also shaping outcomes for relationships, groups, and organizations. Some of those consequences are positive, as when advice promotes individual problem solving or enhances workgroup productivity. Yet advice can also hide ulterior motives, threaten identity, damage relationships, and promote inappropriate action. The Oxford Handbook of Advice provides a broad perspective on how advice succeeds and fails, systematically reviewing and synthesizing theory and research on advice from multiple disciplines, such as communication, psychology, applied linguistics, business, law, and medicine.