Futenma-gū, Shinto shrine in Okinawa Prefecture, Japan

Futenma-gū is a Shinto shrine in Futenma, Ginowan, Okinawa. Its main hall has a dark tiled hip-and-gable roof with raised ornamental blocks on the ridge, set behind a grey stone torii hung with a straw rope and white zigzag streamers. A wide stone stairway with wooden railings leads up from a paved courtyard, and a wooden signboard at the base reads 夏越の大祓.

The shrine began as a cave site of Ryukyuan ancient worship; in the mid-15th century, during the reigns of Shō Kinpuku and Shō Taikyū, Kumano Gongen was jointly enshrined. A 1590 stele, the Futenma Gongen Hi, is the oldest surviving record. In 1945 the priest fled south with the kami; the grounds were seized as part of Camp Zukeran (Camp Foster), and a temporary shrine was built in Taba, Gushikawa. The site was returned in 1949, and the main hall was rebuilt from 1953 with support from Hawaii and Okinawa.

The shrine's name shifted from Futenma-gū to Futenma-gū in 2005 when the main hall was rebuilt; a 1932 film shows the old plaque reading "Futenma-gū." The annual festival is held on the 15th day of the ninth lunar month, and the autumn pilgrimage once drew the Ryukyu king, noro priestesses, and commoners from across the islands.

The shrine is a 2-5 minute walk from the Futenma bus stop, served by routes including 22, 23, 25, 27, 52, 77, 88 and 90. The inner cave sanctuary behind the main hall can be entered from 10:00 to 17:00, though it may close during the New Year period or for shrine events. Part of the cave is open free of charge.

Behind the main hall opens the Futenma-gū Cave, a limestone cavern 280 metres long. Excavations there and around it yielded relics from after the latter half of the early Okinawan shell-mound period, about 3,000 years ago, and animal fossils 20,000 years old; Ginowan City designated it a scenic spot on 1 March 1991. Part of the cave is open free of charge, and the inner sanctuary holds a yin-yang rock called Kohitsuji-iwa, said to bring luck in love.