Sunbiggin Tarn is a tarn near Sunbiggin in Cumbria.

It is in a Site of Special Scientific Interest (SSSI) which also includes the surrounding moorland and limestone pavement of Little Asby Scar.

common bent, mother of thyme, sheep fescue, Sesleria albicans, Galium sterneri grassland Calluna vulgaris Erica cinerea, Vaccinium myrtillus heath Scirpus cespitosus, Erica tetralix wet heath Carex elata, Equisetum fluviatile, Cladium mariscus, Carex rostrata, Potentilla palustris, Phragmites australis swamp, sedge and reed-beds black-headed gull, gadwall, little grebe, osprey, starling, water rail, wigeon[1] Geyer's whorl snail Dinantian, Karst