OBJECTIVES: The London Chest Activity of Daily Living Scale (LCADL) is a simple, useful, and comprehensive measure of dyspnea perception in activities of daily living. This study was conducted to determine the validity and reliability of the Turkish version of the LCADL.MATERIALS AND METHODS: A total of 64 patients with obstructive lung disease (24 chronic obstructive pulmonary disease, 20 asthma,and 20 bronchiectasis patients) were included. The Turkish LCADL was evaluated for interobserver reliability, test–retest reliability, andcriterion validity. Two different observers applied the scale with an interval of 10 minutes to assess interobserver reliability. The secondobserver applied the scale twice at an interval of 10–15 days to assess test–retest reliability. Criterion validity was assessed using the6-minute walk test (6MWT), Nottingham Health Profie (NHP), and Saint George Respiratory Questionnaire (SGRQ).RESULTS: The interobserver reliability of the scale was very high (rs =0.985, p<0.050). Cronbach's alpha coeffiient for total score was0.976 and intraclass correlation coeffiient was 0.953. These results indicate that the Turkish LCADL has high reliability. The correlation between LCADL and 6MWT was moderate 0.503 (p=0.002). The LCADL total score was weakly correlated with NHP total score(r s=0.370, p=0.040) and SGRQ total score (r s =0.367, p=0.004).CONCLUSION: The Turkish version of the LCADL scale is reliable and valid in obstructive lung disease. The LCADL scale will be benefiial in existing pulmonary rehabilitation programs aiming to improve functional status. We believe that using the Turkish LCADL scaleas an outcome measure in pulmonary rehabilitation programs will serve as an indicator of rehabilitation effiacy for individual patients.