Webs are diagnosed by their characteristic appearance on imaging studies, typically appearing as thin, radiolucent rings with or without dilatation of the organ proximal to it. Like in other organs, the etiology of webs in the common bile duct is controversial. Some webs are thought to be congenital, whereas others occur in the presence of chronic inflammation, suggesting a pathogenic relationship. We report a case of a common bile duct septum in association with numerous large black pigment stones in a 62-year-old woman. The patient was treated by cholecystectomy with T-tube insertion.