Thompson Water, Carr and Common is a 154.7-hectare (382-acre) biological Site of Special Scientific Interest north of Thetford in Norfolk, England.

[1][2] Most of it is managed by the Norfolk Wildlife Trust as Thompson Common.

[5] It is crossed by the Great Eastern Pingo Trail Local Nature Reserve.

[6] This grassland site in the valley of a tributary of the River Wissey has a number of pingos, damp and water filled depressions formed by the melting of ice at the end of the last glaciation.

It also has a lake called Thompson Water which, together with its surrounding reedswamp, is important for breeding birds.