The Japanese occupation of the Gilbert Islands was the period in the history of Kiribati between 1941 and 1945 when Imperial Japanese forces occupied the Gilbert Islands during World War II, in the Pacific War theatre.

Banaba is an island of Kiribati in the Pacific Ocean. A solitary raised coral island west of the Gilbert Island Chain, it is the westernmost point of Kiribati, lying 185 miles (298 km) east of Nauru, which is also its nearest neighbour. It has an area of six square kilometres (2.3 sq mi), and the highest point on the island is also the highest point in Kiribati, at 81 metres (266 ft) in height. Along with Nauru and Makatea, it is one of the important elevated phosphate-rich islands of the Pacific.