Kujūkuri Beach is a sandy beach that occupies much of the northeast coast of the Bōsō Peninsula in Chiba Prefecture, Japan. The beach is approximately 60 kilometres (37 mi) long, making it the second longest beach in Japan. Kujūkuri Beach is a popular swimming and surfing destination for inhabitants of Greater Tokyo. The beach is protected as part of Kujūkuri Prefectural Natural Park.
Kujūkuri Beach extends in the shape of an arc from Cape Gyōbumi in Asahi to the north to Cape Taitō in Isumi, Chiba Prefecture to the south. The beach is relatively straight, in contrast to the typically irregular coastlines of Japan. The coastal region of the beach is the north-eastern end of Kuroshio Current influence in Japan. The tides and the Kuroshio Current create sand deposits along the length of the beach which form sand dunes of 4 metres (13 ft) to 6 metres (20 ft). Kujūkuri Beach has no reef.