A Registered Nutritionist, abbreviated RNutr, is a nutritionist listed on the professional register administered by the Nutrition Society in the United Kingdom. Registration signals that the holder has an accredited degree-level qualification in nutrition science, relevant professional experience, and a commitment to evidence-based practice and continuing professional development. It distinguishes qualified nutritionists from the unregulated crowd of self-styled nutrition advisers, giving employers and the public a mark of competence to trust. Registered Nutritionists work across public health, industry, sport, and research, translating nutrition science into practical guidance. The title is protected by the Society’s standards, and registrants must abide by its code of conduct, with fitness to practise procedures for those who fall short.