Many studies have shown that gastric stump cancer develops after distal gastrectomy, particularly after Billroth II reconstruction. But, recurrent cancer at the duodenal stump following Billroth II type distal gastrectomy for gastric cancer is extremely rare. We report a case of duodenal stump cancer in a 64-year-old man underwent Billroth II distal gastrectomy. (Korean J Gastrointest Endosc 2010;40: 266-269)