Background and purpose: Malnutrition, weight loss and low body mass in COPD (Chronic obstructive pulmonary disease) are independent and negative risk factors regarding the survival of these patients. Malnutrition may lead to the deterioration of skeletal and respiratory muscles, causing respiratory failure. Parameters used for nutritional status evaluation include anthropometry, biochemical measurements and subjective global assessment. The number of studies investigating the nutritional status using subjective global assessment in COPD patients were was limited. The aim of this study was to determine the utility of SGA for nutritional status in COPD patients and to determine the relationships between SGA, respiratory function tests, and some nutritional parameters.