Nutrition care is important for patients’ well-being. With legislation for reimbursement for nutrition support team activities from the Korea Ministry of Health and Welfare, this has increased the importance of nurses’ role in nutrition. Nutrition support nurses (NSNs) focus on the optimization of nutritional health and prevention of nutrition-related illness and injury. NSN performs as an advanced practice nurse, a core member of a nutrition support team, an educator or consultant, a policy maker in nutrition care, and a researcher or a member of quality improvement. NSNs should develop their core competency to fulfill their roles in nutrition care and the need to participate in qualified nutrition support education programs. Further, the tasks and duties of NSNs should be specifically identified so that NSNs can fulfill their roles.