Health literacy is important for controlling disease progression and living a healthy life with illness. High health literacy is associated with higher cognitive performance and lower health-related quality of life. Physical, psychological, and social impairments are seen in chronic obstructive pulmonary disease (COPD). Studies investigating the relationship between health literacy and functional capacity, quality of life, physical activity, cognitive function, health-related behavior, and activities of daily living in individuals with COPD are limited. Therefore, the aim of this study was to compare individuals with COPD with healthy individuals in terms of health literacy, functional capacity, quality of life, physical activity, cognitive function, health-related behavior, and activities of daily living and to investigate the relationship between health literacy and functional capacity, quality of life, physical activity, cognitive function, health-related behavior, and activities of daily living in individuals with COPD.