Background Incidence of overweight (defined as BMI 25–30 kg/m 2 in adults) and obesity (BMI >30 kg/m 2 ) is increasing. Scottish Government statistics indicate that over 60% of adults are overweight or obese increasing risk of cardiovascular (CV) disease. Prevalence of overweight and obesity among individuals with Cystic Fibrosis (CF) is also increasing. Rates of 6–13% have been reported throughout Europe and nearly half of Australian adult men with CF are overweight or obese. There does not appear to be the same correlation between overweight/obesity and CV risk in CF but it may place an additional burden on the endocrine pancreas. Being overweight/obese may actually exert a positive effect on lung function contrary to its role in non-CF individuals. This positive association between nutritional status and lung function may be limited when BMI >23 kg/m 2 . Objectives Audit prevalence of overweight/obesity in Scottish Adult CF patients. Methods Scottish Adult CF Centres were invited to take part in the study (n = 4) and asked to complete a short survey. Results were collated and analysed by the Scottish Adult CF Dietitians Results Data was obtained for 531 Scottish Adult CF patients (Aberdeen n=63, Dundee n=46, Edinburgh n=177, Glasgow n=245). 20.7% were overweight/obese (15.6% & 5.1% respectively). In the obese group, mean FEV1 was 87.4% predicted. 11% were post transplant. 84% were non- Pseudomonas aeruginosa (PA). 59.3% were pancreatic sufficient. 26.9% had abnormal glucose tolerance. Conclusion One fifth of the Scottish Adult CF population are overweight indicating higher prevalence than the rest of Europe.