Southrepps Common is a 5.6-hectare (14-acre) biological Site of Special Scientific Interest north of North Walsham in Norfolk, England.

[1][2] A larger area of 12.9-hectare (32-acre) is a Local Nature Reserve.

[3][4] It is part of the Norfolk Valley Fens Special Area of Conservation.

[5] This is damp grassland and fen in the valley of the River Ant.

There are several rare true flies characteristic of undisturbed wetlands, especially Pteromicra glabricula and Colobaea distincta, both of which have larvae which are parasitic on snails.