Background: Pulmonary hypertension is a serious complication of COPD and is associated with poor prognosis. Thus early detection and treatment of pulmonary hypertension becomes important to prevent right heart failure. Echocardiogrpahy provides a rapid, noninvasive, portable, and accurate method to evaluate the cardiac changes. Aims and objectives: To study prevalence of pulmonary hypertension in patients of COPD using 2D–echocardiography and to find out the correlation between echocardiographic finding and severity of COPD. Material and Methods: This was a observational study which included randomly selected 140 patients of COPD. The patients were selected from the medical outpatient and indoor of M.D.M. Hospital, Dr S.N. Medical College, Jodhpur. Results: Out of 140 cases analysed, Echocardiography reported Pulmonary hypertension in COPD patients was 40.71% (57 out of 140), and cor pulmonale in 31.43 %. The percentage of PHTN patients in mild, moderate, severe & very severe COPD patients was 18.03%, 40.00%, 65.08%& 79.17% respectively. Conclusion: Echocardiography demonstrated pulmonary hypertension and cor–pulmonale in present study. The patients with cardiac comorbidities were relatively older, had a longer duration of illness, were suffering from severe disease with lower FEV1 values and experienced frequent exacerbations. The frequency of pulmonary hypertension has a linear relationship with severity of airflow obstruction in COPD patients.