Chatteris is a market town and civil parish in the Fenland district of Cambridgeshire, England, situated in the Fens between Huntingdon, March and Ely. The town is in the North East Cambridgeshire parliamentary constituency. The parish of Chatteris is large, covering 6,099 hectares, and for much of its history was a raised island in the low-lying wetland of the Fens. Mentioned in the Domesday Book of 1086, the town has evidence of settlement from the Neolithic period.