Postoperative parotitis is a well known entity which can develop in patients who undergo major abdominal surgery.We present a case of postoperative parotitis which occurred after a laparotomy for incisional hernia repair.After establishing diagnosis by ultrasonography assessment and blood chemical tests, patient was successfully treated by morphine discontinuing and antibiotics therapy.Beside sialolithiasis, sitting position or dehydratation we suggest that morphine could play a substantial role in the development of postoperative parotitis.