Chanctonbury Hill is an 82.7-hectare (204-acre) biological Site of Special Scientific Interest west of Steyning in West Sussex.

[1][2] Part of it is Chanctonbury Ring, an early Iron Age hillfort which contains two Romano-Celtic temples and which is a Scheduled Monument.

[3] This site on the steep slope of the South Downs is mainly woodland with some areas of chalk grassland.

A dew pond has great crested newts, a species protected under the Wildlife and Countryside Act 1981.

More than sixty species of breeding birds have been recorded, including meadow pipits, corn buntings and green woodpeckers.