The Atkinson-Koskinen Site, designated 45.13 by the Maine Archaeological Survey, is a prehistoric archaeological site in or near Steuben, Maine. Its main feature is a non-shell refuse midden, a rarity on the coast of eastern Maine. Along with the Goddard Site in Brooklin, it is important in analyzing land use and subsistence patterns during the Late Ceramic period (1000-1400 CE). The site was listed on the National Register of Historic Places in 1984.