A case of a complicated postoperative course after laparoscopic cholecystectomy in which, ultimately, gallbladder duplication was suspected and confirmed at laparotomy is described. The diagnostic tools, differential diagnosis, and therapy are discussed. After open cholecystectomy patients' complaints dissolved. Awareness of the possibility of a double gallbladder in case of persisting symptoms after laparoscopic cholecystectomy can lead to diagnosis of this condition at an earlier stage.