Sigmoid volvulus is a unfrequent cause of colon obstruction in Korea. Colonoscopic reduction and decompression is the preferred initial treatment of patients with sigmoid volvulus who do not have signs of bowel strangulation because of the high mortality associated with emergency surgery. We experienced a case of sigmoid volvulus in a 60-year-old male who presented with constipation, abdominal distension and abdominal pain. Sigmoid volvulus was diagnosed by simple abdominal film and he had taken successful emergency colonoscopic reduction of sigmoid volvulus, We report our experience & reviews the literature on the use of the colonoscope to treat sigmoid volvulus. (Korean J Gastrointest Kndosc 2001;22:440-443)