Leiomyoma, one of the primry benign tumors of the lung, is extremely rare. Few cases reported in the literature suggest that this tumor occurs most commoly in the fourth decade and that over 90 percent of the pulmonary parenchymal leiomyomas occur in women and almost all lesions are found incidentally on chest radiographs. Treatment has been conservative surgery and 65 percent of the reported cases have been managed by lobectomy or pneumonectomy for advanced irreversible lung diseases or unw-areness of the benign nature of the lesion. This report is a case of pulmonary parenchymal leiomyoma in a 46-year-old female patient. She underwent surgical resection and the postoperative result was good.