Mucormycosis is a fatal fungal infection occurring in immunocompromised patients. Small bowel mucormycosis is extremely rare with a high mortality rate. We report the case of a 12-year-old girl with postcoronavirus disease (COVID) recent-onset diabetic ketoacidosis, who presented with acute abdomen with fecal peritonitis. She was diagnosed with intestinal mucormycosis (post-COVID) and was treated successfully with surgical and antifungal management.