Aspergilloma infection in the lung can occur in preexisting cavities and is usually seen after tuberculosis, pulmonary infarction and bronchestasis. Occassionally aspergilloma has been reported within a hydatid cyst. We describe a patient with aspergilloma formed within cyst hydatid. The primary symptom in this patient was recurrent hemoptysis. In this 42-year-old male, the diagnosis was established by HRCT chest. Treatment consisted of postero-lateral thoracotomy with a bilobectomy of lower and middle lobe. Aspergilloma is an unusual complication of hydatid cyst and results from the deterioration of local defence against opportunistic infections.