Douglas Park is a town of the Macarthur Region in New South Wales, Australia in Wollondilly Shire. It is near the Hume Highway, the F5 Freeway and on the Main Southern railway line. Its station is served by NSW TrainLink's Southern Highlands Line. It is about 80 km southwest of Sydney. At the 2016 census, Douglas Park had a population of 1,362 people.