One Tree Hill is a town on the outskirts of Adelaide, South Australia. It is located in the City of Playford.

The 2016 Census by the Australian Bureau of Statistics counted 1,095 persons in One Tree Hill on census night. Of these, 569 (52.2%) were male and 522 (47.8%) were female. The majority of residents 791 (72.7%) are of Australian birth, with 155 14.2% born in England. The median age of One Tree Hill residents is 45. Children aged 0 – 14 years made up 16.8% of the population and people aged 65 years and over made up 14.9% of the population.

There is no specific provision for bicycles on any of the local roads. There are footpaths on most roads within the town and along Black Top Road in some sections up three kilometres west of the town using land from the old alignment of the road.