The Shinpukuji shell mound (真福寺貝塚, Shinpukuji kaizuka) is an archaeological site in the Iwatsuki neighborhood of the city of Saitama, Saitama Prefecture, in the Kantō region of Japan containing a late Jōmon period shell midden and settlement ruin. The site was designated a National Historic Site of Japan in 1975, with the borders extended in 2002 and again in 2016.