Colo is a small town located north-west of Sydney in New South Wales, Australia. It is home to the Colo River and parts of the Wollemi National Park. The main road through Colo is Putty Road. The locality of Colo is bounded in the south and the east by the Hawkesbury River.
Colo was counted as part of Mountain Lagoon at the 2011 census, which had a population of 327.