Background: Injury is the leading cause of childhood death and disability in Australia. Prehospital emergency services in New South Wales (NSW) are provided by NSW Ambulance. The incidence, pre-hospital care provided and outcomes of children suffering major injury in NSW has not previously been described.Methods: This retrospective study was conducted between July 2015 and September 2016 and included children < 16 years with an injury severity score (ISS) > 9, or requiring intensive care admission, or deceased following injury and treated in NSW. Children were identified through the three NSW Paediatric Trauma Centres, the NSW Trauma Registry, NSW Medical Retrieval Registry ( AirMaestro , Avinet, Australia).Results: There were 359 majorly injured children treated by NSW-based emergency service providers, the majority were male (73.3%) with a mean (SD) age of 8.0 (5.2) years. The median (IQR) injury severity score (ISS) for those transported via NSW emergency medical services was 10 (9-17), with almost half (44.1%) treated prehospital having an ISS > 12. The most common documented interventions were intravenous access (44.1%) and oxygen therapy (39.6%). Intubation and chest decompression were recorded in 15.3% and 3.1% of cases respectively. The calculated median (IQR) transport charges for NSW Emergency Services