Clonorchiasis is a trematodasis caused by ingestion of a raw fish that contains the infective cysts. In cases of early infection, the patients complained non-specific gastrointestinal symptoms, including anorexia, epigastric pain or diarrhea. In cases of long-standing infection, an association with gallstones, choledocholithiasis, cholangitis and cholangiocarcinoma has been reported. However, acute hemorrhagic complications of clonorchiasis are extremely rare. Herein, we report on a case of hemobilia that was caused by Clonorchis sinensis, and this was confirmed by operation. (Korean J Gastrointest Endosc 2008;36:313- 317)