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Background: Thoracic scoliosis is a lateral curvature of the spine associated with restrictive lung defects, manifested by a decrease in respiratory function tests. We undertook this study to evaluate the effect of a respiratory rehabilitation program over lung function in children with scoliosis., Methods: We carried out a prospective and deliberate intervention study including 25 consecutive patients, aged 6 to 18 years, diagnosed with thoracic scoliosis. The respiratory rehabilitation program was structured into two phases: institutional and private residence. Statistical analysis was carried out using descriptive parameters and paired t-test and Wilcoxon signed-ranks test. Spearman correlation was used to measure intensity of association among variables. Statistical significance was considered when p <0.05., Results: Idiopathic scoliosis was present in 52% of patients, with right dorsal curvature in 72%. Cobb angle average was 50.6° ± 29.7°. Most importantly, we found a negative correlation between this angle on left curvature and lung function. Initially, the main respiratory symptoms were dyspnea with poor effort tolerance in 52%. After treatment, 88% of patients were asymptomatic and only 4% presented poor effort tolerance. Oxygen saturation and forced vital capacity percentage had a significant increment after the program., Conclusion: Respiratory rehabilitation has a positive effect on increasing pulmonary function of children with scoliosis.