Background:Childhood obesity is a severe health issue that impacts both adults and children, increasing the risk of diabetes, high blood pressure, and high cholesterol. The present study was conducted to assess peak expiratory flow rate and spirometry in obese and nonobese school children. Materials & Methods:120 students aged 12-16 years of both genders were studied. FVC, FEV1, and forced expiratory flow (FEF) at the mid portion of FVC (FEF 25–75). PEFR was measured by Wright’s mini peak flow meter. Results: Out of 120 subjects, males were 50 and females were 70. The age group 11 years had 5obese and 10 nonobese subjects. 12 years had 7 and 14, 13 years had 4 and 11, 14 years had 8and 9, 15 years had 6 and 13 and 16 years had 12 and 21 obese and nonobese subjects respectively. The difference was significant (P< 0.05). The mean FEV1 in obese male was 88.3 and in obese female was 89.0. FVC was 88.6 and 88.9, FEV1 /FVC was 99.7 and 99.3, FEF25%-75% was 79.5 and 79.1 and PEFR (L/min) was 228.1 and 228.4 in male and females respectively. The difference was non- significant (P> 0.05). Conclusion: Authors found that comparing obese patients to non-obese patients, lung function is normal in obese patients. Expanding the use of this tool by patients and medical professionals alike will aid in the early detection of respiratory conditions and enhance the quality of care for young patients. One can enhance our lung function by maintaining a fit and healthy body.