The International Federation for the Surgery of Obesity and Metabolic Disorders (IFSO) is a federation composed of 63 official national associations of bariatric surgeons and individual members.

IFSO's Mission is to Unify the Global Scientific, Surgical and Integrated Health Communities, for the Purpose of Dissemination of Knowledge, Collaboration and Establishing Universal Standards of Care for the Treatment of Individuals with Adiposity-Based Chronic Disease.

The main goal of IFSO is the optimisation of the treatment of severely obese patients bringing together surgeons and allied health professionals. IFSO is committed to the creation of a global system for accreditation of bariatric centres and individual surgeons.

IFSO's main activity is the organization of the yearly World Congress, which provides a forum to exchange knowledge on surgical treatment of severely obese patients, to present new techniques, research and concepts, and to meet the experts in the field.