Chalfont St Giles is a village and civil parish in southeast Buckinghamshire, England. It is in a group of villages called The Chalfonts, which also includes Chalfont St Peter and Little Chalfont.

Buckinghamshire is a ceremonial county in South East England and one of the home counties. It is bordered by Northamptonshire to the north, Bedfordshire to the north-east, Hertfordshire to the east, Greater London to the south-east, Berkshire to the south, and Oxfordshire to the west. The largest settlement is the city of Milton Keynes, and the county town is Aylesbury.