A biliary cystadenoma and a cystadenocarcinoma are rare intrahepatic cystic neoplasm. The clinical feature is not marked but abdominal fullness and mass are the most common symptoms. The tumor is commonly a large multilocular cystic mass which requires hepatectomy for cure. We experienced one case of biliary cystadenoma and two cases of biliary cystadenocarcinoma. The biliary cystadenoma case was a 58-year-old female with right upper quadrant discomfort for 5 months and a 17 cm sized multilocular cystic mass. The serum CA 125 level was elevated but returned to normal level after resection. A right hepatectomy was performed and the patient has had no recurrence for 14 months after the resection. One of the biliary cystadenocarcinoma cases was a 42-year-old man with a 12 cm sized multilocular cystic mass in the right upper quadrant of his abdomen. A right hepatectomy was performed and the patient has had no recurrence for 12 months after the resection. The other biliary cystadenocarcinoma case was a 70-year-old man with right upper quadrant pain and a 5 cm sized cystic mass. A left hepatecomy was performed and the patient has had no recurrence for 8 month after the resection. The treatment of choice for a biliary cystadenoma or cystadenocarcinoma is complete resection. We report three cases of biliary cystadenoma and cystadenocarcinoma with a review of the literature.