Ōzato Castle (大里城, Ōzato jō, Okinawan: Ufuzatu Gushiku), officially Shimasoe-Ōzato Castle (島添大里城, Shimasoe-Ōzato jō, Okinawan: Shimashii-Ufuzatu Gushiku), is a Ryukyuan gusuku built in Nanzan and used until 1429.

It is in ruins, and is an officially designated historical site in Nanjō City, Okinawa.

[1] Nanzan was established in 1314 when the Lord of Shimajiri-Ōzato, Ōzato Ofusato, broke away from the chieftain Tamagusuku at Urasoe Castle.

During an excavation of the site, Chinese ceramics were found, showing the extensive trade that Nanzan had done with Ming China.

[3] In 2012, Ōzato castle became an officially designated historical site on Okinawa Island.