Chawridge Bourne is a 9.4-hectare (23-acre) biological Site of Special Scientific Interest in Berkshire, England[1][2] Part of the site is a 5-hectare (12-acre) nature reserve called Chawridge Bank, which is managed by the Berkshire, Buckinghamshire and Oxfordshire Wildlife Trust.

[3] The name Chawridge is first attested in a charter of 942, which includes the Old English phrase "on ceawan hrycges hagan" ("to the enclosure of Ceawa's ridge"),[4] where Ceawa is a personal name attested only here and in the place-names East and West Challow.

[4] This linear site is named after the stream called Chawridge Bourne, which runs through it.

Half of it is unimproved grassland, which is managed by sheep grazing.

On the east side there is an ancient parish boundary hedge which has diverse tree flora.