Coolaroo is a suburb of Melbourne, Victoria, Australia, 19 km north of the Melbourne CBD. Its local government area is the City of Hume. At the 2016 Census, Coolaroo had a population of 3,191.
Coolaroo is an Aboriginal word for 'star'. The popular 1997 Australian film The Castle was set in Coolaroo, although the house featured was actually located in Strathmore. Coolaroo railway station opened to passengers on Sunday 6 June 2010, almost 40 years after plans for a station first surfaced.