Coordinates: 4°27′S 171°16′W / 4.45°S 171.267°W / -4.45; -171.267

Manra Island or Sydney Island, is one of the Phoenix Islands in the Republic of Kiribati. It lies at 4°27′S 171°16′W / 4.45°S 171.267°W / -4.45; -171.267. W. longitude, and has an area of 4.4 km². and an elevation of approximately six meters. Together with the seven other Phoenix Islands, it forms part of the Phoenix Islands Protected Area, the world's largest marine protected area.

Though it has been occupied at various times in the past (including as late as 1963), Manra is currently uninhabited.

Manra is triangular in shape, measuring approximately 3.2 km by 2.8 km. It completely surrounds a hyper-saline lagoon without outlet to the sea, containing depths of five to six meters. The island is covered with coconut palms, scrub forest, herbs and grasses, including the species Tournefortia, Pisonia, Morinda, Cordia, Guettarda, and Scaevola. Manra was formerly a functioning copra plantation, though it is no longer.

Bird life is similar to the other Phoenix Islands, but has been described as "less abundant". Hermit crabs and rats are plentiful on the island, which also supports colonies of feral dogs, pigs and cats. According to E.H. Bryan, "insects are abundant, including a blue and white butterfly, several kinds of moths, dragonflies, ants, flies, leafhoppers, bugs, beetles, wasps, and spiders". Mosquitoes arrived in the late 19th century, on a ship from Tahiti.