Objective: The objective of this study was to investigate the association between antioxidant nutrients and markers of oxidative stress with pulmonary function in persons with chronic airflow limitation. Design: Cross-sectional study exploring the association of antioxidant nutrients and markers of oxidative stress with forced expiratory volume in the first second (FEV 1 %) and forced vital capacity (FVC%). Setting/Subjects: The study data included 218 persons with chronic airflow limitation recruited randomly from the general population of Erie and Niagara counties, New York State, USA. Results: After adjustment for covariates, multiple linear regression analysis showed that serum b-cryptoxanthin, lutein/ zeaxanthin, and retinol, and dietary b-carotene, b-cryptoxanthin, lutein/zeaxanthin, vitamin C, and lycopene were positively associated with FEV 1 % (Po0.05, all associations). Serum vitamins b-cryptoxanthin, lutein/zeaxanthin, and lycopene, and dietary b-cryptoxanthin, b-carotene, vitamin C, and lutein/zeaxanthin were positively associated with FVC% (Po0.05, all associations). Erythrocytic glutathione was negatively associated with FEV 1 %, while plasma thiobarbituric acid-reactive substances (TBARS) were negatively associated with FVC% (Po0.05). Conclusion: These results support the hypothesis that an imbalance in antioxidant/oxidant status is associated with chronic airflow limitation, and that dietary habits and/or oxidative stress play contributing roles.