The objective of this work was to verify the relationship between the iron reserve in the form of ferritin and the amount of physical activity performed by patients with COPD. The study was carried out at the pneumology outpatient clinic of University Hospital Maria Aparecida Pedrossian and in it individuals with a diagnosis of COPD had the concentration of ferritin and blood ferric profile measured and correlated with the amount of physical activity verified through the short version of the International Activity Physics Questionnaire, converted to weekly energy expenditure in Kcal, using the AINSWORTH compendium. It was concluded that COPD patients with higher blood ferritin levels were able to perform more physical activity.