巴纳巴岛，亦称大洋岛,是基里巴斯吉尔伯特群岛的一个岛屿，位于瑙鲁以东300公里。为一珊瑚岛。面积6.5平方公里，人口301（2005年）。岛上有4座村庄。巴纳巴岛最高点海拔81米，也是基里巴斯的海拔最高点。1942年8月，该岛被日军占领。1979年，该岛归属基里巴斯。

Banaba Island (/bəˈnɑːbə/; also Ocean Island), an island in the Pacific Ocean, is a solitary raised coral island west of the Gilbert Island chain and 185 miles (298 km) east of Nauru. It is part of the Republic of Kiribati. It has an area of 6.0 km², and the highest point on the island is also the highest point in Kiribati, at 81 metres (266 ft) high. Along with Nauru and Makatea (French Polynesia), it is one of the important elevated phosphate-rich islands of the Pacific.