ABSTRACT BACKGROUND:Pelvic tilt is a position- dependent parameter defined as the angle created by a line running from the sacral endplate midpoint to the center of the bifemoral heads and the vertical axis. COPD is characterized by generalized airflow of obstruction, the major site of obstruction being the small airways. Pulmonary function tests(PFT) are useful in measuring the functional status of the lung both in physiological and pathological conditions. PURPOSE: The purpose of this study was to investigate the effect of pelvic tilt position on lung function in COPD patients achieving pelvic tilts on a chair.METHODOLOGY: The study was conducted among 20 COPD patients (age=30 to 72) from SRM Medical College Hospital and Research Center by using Computerized Spirometer (Easyone pro). While they were performing pelvic tilt on a chair, FVC,FEV1,FEV1/FVC,PEFR were measured at anterior, neutral and posterior pelvic tilts.RESULTS: This study showed that the mean values of FVC, FEV1, FEV1/FVC, and PEFR gained from anterior, neutral and posterior pelvic tilt positions of COPD patients were almost similar and there was no statistical significance (p>0.05). CONCLUSION: This study concludesthat there is no effect of pelvic tilt positions on PFT in COPD patients.