The Horinouchi Shell Midden (堀之内貝塚, Horinouchi kaizuka) is an archaeological site in the Horinouchi neighborhood of the city of Ichikawa, Chiba Prefecture, in the Kantō region of Japan containing a Jōmon period shell midden and settlement ruin. The site was designated a National Historic Site of Japan in 1964, with the area under designation expanded in 1967 and again in 1972.