From Jan. 1981 to Dec. 1993, 24 cases of pulmonary hamartoma were experienced sugically at the Department of Thoracic Surgery, College of Medicine, Seoul National University. They consisted of 11 females and 13 males. The age distribution was 24 years to 71 years with a mean age of 49 years. They included 3 cases of endobronchial hamartoma, and 21 cases of pulmonary parenchymal hamartoma. Fifty eight percent of patients [14/24] were asymptomatic. One patient had a multiple pulmonary parenchymal hamartoma, and 1 patient also had combined lung cancer. The operative procedures were 9[37.5%] wedge resections, 5[20.8%] lobectomies, 3[12.5%] enucleations, 3[12.5%] segmental resections, 2[8.3%] bilobectomies, 1[4.2%] lobectomy and segmentectomy, and 1[4.2%] lobectomy, wedge resection, and enucleation. All of the operative results were excellent and without complication.