The Australasian Association and Register of Practicing Nutritionists (AARPN) is the peak body allied health association for professional nutritionists, these being degree qualified clinically trained nutritionists, which AARPN accredits through its Certified Practicing Nutritionist (CPN) program.

AARPN is Australia's first independently mono-modality association exclusively representing and advocating for clinically trained tertiary-level qualified professional nutritionists (Practicing Nutritionists) who practice Clinical Nutrition.

Clinical Nutrition (which AARPN formally terms Nutrition Practice) is grounded in the scientific evidence based application of nutritional interventions and evolved from the merging of medicine and nutrition science in the 1950's, hence its other name, “Nutritional Medicine”. It includes independent clinical assessment of the client and individualised dietary based modification, and additionally includes the complex prescribing of nutritional supplements to the diet, for the maintenance of health, and in support of the remediation of disease.