The gas gangrene usually occurs in the limbs after trauma. We have experienced a case of non-traumatic gas gangrene in the low back. The patient was a forty-year-old female suffering from diabetes. When the patient admitted in our clinic, in the lumbar region and left side part of the neck and thorax, interstitial gas was demonstrated radiographically. On the bacteriological examination, L. coli was detected but clostridium was not detected. We diagnosed non-clostridial gas gangrene. The patient was treated with debridment and antibiotics. The wound was closed by skingraft after fresh granulations occurred. The patient made a good recovery.