The South Coast Line (SCO) is an intercity rail service operated by NSW TrainLink that services the Illawarra region of New South Wales, Australia. The service runs from Central, and runs the entire length of the eponymous South Coast railway line to Bomaderry. The service also runs along the Eastern Suburbs railway line at peak hours and the Port Kembla railway line to Port Kembla. It is operated with NSW TrainLink H sets and Sydney Trains T sets, with Endeavour railcars operating the service on the non-electrified line between Kiama and Bomaderry.

NSW TrainLink is a train and coach operator in Australia, providing services throughout New South Wales and the Australian Capital Territory, along with limited interstate services into Victoria, Queensland and South Australia. Its primary intercity and regional services are spread throughout five major rail lines, operating out of Sydney's Central railway station.