Nonouti is an atoll and district of Kiribati. The atoll is located in the Southern Gilbert Islands, 38 km north of Tabiteuea, and 250 km south of Tarawa. The atoll is the third largest in the Gilbert Islands and is the island where the Roman Catholic religion was first established in Kiribati, in 1888.

Kiribati, officially the Republic of Kiribati, is an island country in the Micronesia subregion of Oceania in the central Pacific Ocean. Its permanent population is over 119,000 as of the 2020 census, with more than half living on Tarawa atoll. The state comprises 32 atolls and one remote raised coral island, Banaba. Its total land area is 811 km2 (313 sq mi) dispersed over 3,441,810 km2 (1,328,890 sq mi) of ocean.