Harrington Park is a suburb of the Macarthur Region of Sydney in the state of New South Wales, Australia in Camden Council.

[2] The area now known as Harrington Park was originally home to the Muringong, southernmost of the Darug people.

The region was declared a Government reserve although settlers such as John Macarthur soon lobbied the Governor for land grants in the rich farming area.

In 1813, 2,000 acres (8.1 km2) in the area was granted to trader Captain William Douglas Campbell as compensation for the loss of his snow Harrington which was seized by convicts, from its anchorage in Sydney Harbour, on the evening of 15 May 1808.

When Captain Campbell died in 1827, he left Harrington Park to his two nephews, Murdock and John from Scotland, both of whom worked on the land.

Abraham Davy bought Harrington Park from James Rofe in June 1853 for 2000 pounds.

Sir Warwick Fairfax carried out renovations and additions to the homestead and set up a nursery in the 1950s specialising in camellias, roses and imported flowers.