Human hydatidosis, caused by Echinococcus granulosis remains a considerable public health, economic, and social problem in many countries of the world. Cardiac involvement is rare in hydatid disease, but it carries a significant risk of potentially lethal complications. Cardiac hydatid cysts are mostly intramyocardial. Two patients with cardiac involvement of hydatid disease are presented: öne with hydatid cyst of the left ventricular posterior wall, and the other with ruptured left ventricular cyst associated with pulmonary arterial and pericardial cyst. Surgical excision under cardiopulmonary bypass was performed successfully in both patients.