Green Croft and Langley Moor is a Site of Special Scientific Interest in the Derwentside district in north County Durham, England. It consists of three separate areas, two to the south of Annfield Plain and one just west of Quaking Houses, between the towns of Consett, to the west, and Stanley, to the east. All three locations contain areas of heath and mire, habitats that are, except at Waldridge Fell, rare and fragmented in lowland Durham. At Langley Moor there is an area of woodland which is dominated by downy birch, Betula pubescens, with some sessile oak, Quercus petraea.