This chapter covers the clinical features, decision making, aetiology, pathophysiology, and management of a broad range of surgical conditions that may occur in children and require operative intervention. First, the relevant symptoms are described including vomiting, dysphagia, vomiting, bleeding, the ingestion of foreign bodies, constipation, and jaundice. Then the surgical pathology itself is considered in detail with individual sections on head and neck lesions, thyroid disease, tumours, oesophageal disorders, appendicitis, inflammatory bowel disease, choledochal malformations, intussusception, short bowel syndrome, rectal prolapse, abdominal wall hernias, and bariatric surgery among others. Where appropriate, the details of the surgical operations are described.