Surgery currently is the only curative option in the treatment of gastric cancer. For early gastric cancer, an endoscopic mucosal resection (EMR) is adequate for intramucosal cancer less than 2 cm in diameter without ulcer. For early cancers ineligible for EMR, limited surgical operation (proximal gastrectomy, segmental resection, and pylorus-preserving distal gastrectomy) can be recommended to reduce surgical risk and achieve improvements in quality of life without decreasing survival. Subtotal/total gastrectomy plus D2 lymph node dissection is the standard surgery for advanced gastric cancer in Japan. Pancreas-preserving total gastrectomy is recommended due to the reduced risk of pancreatic fistula and postoperative diabetes. Regarding extended surgery, results of a phase III study to evaluate the role of paraaortic node dissection will be analyzed in a few years' time after the accrual of more than 500 patients in a Japan Clinical Oncology Group (JCOG) study. For scirrhous gastric cancer, left upper abdominal exenteration appears to be associated with improved survival and should be tested in another controlled trial.