It is crucial to realize that both omental infarction and acute appendicitis can occur simultaneously in the children as both diseases are managed differently. Omental infarction itself is rare in the pediatric group, and its association with acute appendicitis is even rarer. Both diseases usually present with right sided abdominal pain. Ultrasound is the choice of imaging modality in the investigation of abdominal pain in the children. It should not be content if omental infarction is detected, whilst the normal appendix is not seen. We reported a case of simultaneous omental infarction and acute appendicitis in a child who presented with 3 days history of right sided abdominal pain. It was diagnosed preoperatively by ultrasound. Prompt surgical intervention was proceeded and the child made uneventful recovery.