A study of respiratory function was carried out in 192 adult Sri Lankan females of age group 19 - 29 years. Vital capacity (VC), Forced vital capacity (FVC), forced expiratory volume in one second (FEV1) and maximum voluntary ventilation (MVVF) were measured by spirometry and the peak flow rate by a mini Wright peak flow meter. The dues observed were found to be less than that reported for Europeans and closer to those of North Indian populations. The relationship of the results to-height and weight was studied. Prediction formulae based on height were derived for some of the tests.