Great Gaddesden
Church of St. John the Baptist
Great Gaddesden Location within Hertfordshire
Population	972 (2011 Census including Ballingdon Bottom)[1]
OS grid reference	TL030113
Civil parish	Great Gaddesden
District	Dacorum
Shire county	Hertfordshire
Region	East
Country	England
Sovereign state	United Kingdom
Post town	HEMEL HEMPSTEAD
Postcode district	HP1, HP2
Dialling code	01442
Police	Hertfordshire
Fire	Hertfordshire
Ambulance	East of England
UK Parliament	Harpenden and Berkhamsted
List of places UK England Hertfordshire 51°47′28″N 0°30′36″W / 51.791°N 0.510°W / 51.791; -0.510

Great Gaddesden /ˈɡædzdən/ is a village and civil parish in Dacorum Hundred in Hertfordshire, England. It is located in the Chiltern Hills, north of Hemel Hempstead. The parish borders Flamstead, Hemel Hempstead, Nettleden and Little Gaddesden and also Studham in Bedfordshire.

The Church of St. John the Baptist was probably the site of a pre-Christian sanctuary. The church shows features of every period since the 12th century. Part of the chancel with Roman bricks dates back to the early 12th century. The old church was extended by the south aisle in the 13th century and the north aisle in the 14th century, while the west tower was built in the 15th century and the north chapel in the 18th.

The medieval convent of St Margaret's stood northwest of the village. For a while the site served as a WW2 Royal Canadian Air Force transit camp and later a boarding school for children with special needs, and it is now a Theravadin Buddhist monastery of Thai Forest Tradition, the Amaravati Buddhist Monastery, complete with temple.

Gaddesden Place, east of the village, was built from 1768 to 1773 for the Halsey family. It is surrounded by a large park. In 1905 a fire destroyed the interior of the main house.

The River Gade takes its name from Gaddesden (or vice-versa). Its clear water is used for watercress beds along the river, and at Water End, south of Great Gaddesden, is an old corn mill. The bridge over the river at Water End has a medieval appearance but was built in the 19th century.

Media related to Great Gaddesden at Wikimedia Commons