St Hilary is a civil parish and village in west Cornwall, United Kingdom. It is situated approximately five miles (8 km) east of Penzance and four miles (6.5 km) south of Hayle.
Chynoweth is an area immediately north of St Hilary.
For the purposes of local government St Hilary is a parish council and elects councillors every four years. The principal local authority in the area is Cornwall Council.
The parish church (see also St Hilary Church, Cornwall) is dedicated to St Hilary and is in the Early English style. It has a 13th-century tower and is a Grade I listed building.
The area has many former mines: especially notable was a mine called Wheal Fortune which extended into the parish of Ludgvan. An earthquake occurred in St Hilary in 1796.
Notable people from the parish include Malachy Hitchins, astronomer and Vicar of St Hilary; Denys Val Baker, the writer; Bernard Walke, Vicar of St Hilary, from 1912 to 1936.