Andrena bicolor, or Gwynne's mining bee, is a common and widespread Western Palearctic mining bee which is found over most of Europe as well as North Africa and the Middle East and which reaches eastwards into Siberia.

Andrena bicolor is a small to medium-sized mining bee, with the males being slightly smaller than the females.

[3] Andrena bicolor is a widely distributed species in Europe from most of Great Britain and Ireland in the west to southern Fennoscandia south to the Mediterranean, including Corsica, the Balearic Islands, Sicily, Crete and Cyprus but it is not found on Sardinia, its range extends east into Russia and Central Asia.

[3][2] However, the summer brood females feed mainly from bell flowers, in particular the harebell (Campanula rotundifolia) and the clustered bellflower (Campanula glomerata)[2] as well as such species as white bryony (Bryonia alba), blackberry (Rubus spp.

[2] The cleptoparasitic nomad bee Nomada fabriciana is associated with A. bicolor[3] and the fly Stylops gwynanae may "stylopise" A. bicolor in Spain and eastern Europe and larval Stylops have been observed on adult A.