Omental infarction is a rare entity in children that is usually diagnosed during surgery for suspected appendicitis. We report the clinical case of an obese boy presenting with abdominal pain and right-sided tenderness without fever, anorexia, or leukocytosis. Abdominal ultrasonography suggested omental infarction, and computed tomography confirmed the diagnosis. Nonoperative management was adopted with rapid and uneventful recovery. Nonoperative treatment of omental infarction is safe and effective; accurate diagnosis is therefore crucial to enable a conservative approach. Suggestive clinical features and diagnostic workup are addressed.