The simultaneous association of a gastric carcinoid tumor with adenocarcinoma as a synchronous dual malignancy of the stomach in a same patient is extremely rare. The carcinoid syndrome is an endocrine manifestation of neoplastic enterochromaffin cells. The humoral consequences of entero- chromaffin carcinoid tumors include facial flushing, diarrhea, bronchoconstriction, and so on. Thus classical functional carcinoid syndrome, however, is surprisingly infrequent in gastric lesions. Therefore, the precise diagnosis of carcinoid tumor of the stomach is occasionally made by the histopathologic demonstration of argyrophilic granules in tumor cell cytoplasm. We report, hereby, two cases of the coincidence of carcinoid tumor and adenocarcinoma of the stomach, and review the literatures.