Abstract. Background: The case of post TB is a problem that arises in the community. Pulmonary tuberculosis (TB) can affect lung function. Therefore, we evaluated impaired pulmonary function in subjects with diagnosed prior pulmonary TB. Method: A Case Series study, pulmonary function test was performed in subjects with history of pulmonary tuberculosis,  aged > 18 years were included. Exclusion criteria was subject who had asthma, obesity, abnormal thorax and smoking history. We measured FEV₁ and FVC to evaluate pulmonary function. Airflow obstruction was defined as FEV₁/FVC% < 75 and restriction was defined as FVC<80% according to Indonesia’s pneumomobile project. Results: This study was obtained from 23 patients with post pulmonary TB,  5 subjects (23%) had airflow obstruction with  FEV₁/FVC% value <75%,  15 subjects (71.4%) had abnormalities restriction with FVC value < 80% and 3 subjects (5,6%) had normal lung function. Conclusion: Obstructive lung disease  is one of the complications of impaired lung function  in post pulmonary TB. Keywords: post pulmonary TB, impaired lung function, obstructive lung disease