Bladder perforation during laparoscopy is a recognized, uncommon complication. We present two cases of bladder perforation during laparoscopic gynecologic operations that were detected by gaseous distention of the urinary bag. Bladder perforation occurred through laparoscopic division of adhesion. One bladder perforation was repaired laparoscopically, and the other case was repaired by laparotomy during the same general anesthesia. In this report, we present evidence that monitoring a gas-distended urinary bag during a laparoscopic procedure can help detect intraoperative bladder perforation.