The management of benign strictures of the biliary ducts is one of the most difficult problems in abdominal surgery. While the diagnosis is usually evident from the history, the operative intervention to restore the normal flow of bile into the gastrointestinal tract presents many technical problems and requires the greatest ingenuity on the part of the surgeon. This paper will report on a series of 123 patients operated on at the Lahey Clinic previous to Jan. 1, 1945. Since that time 38 additional patients have been treated, and some of my most recent experiences will be discussed, because further improvements in technical methods have been made during this period. No presentation of this subject should be made without particular emphasis on the prevention of benign strictures, since most of them are the result of a surgical accident during cholecystectomy. Furthermore, strictures that result from infalmmation or from a stone that