The Nauruan Civil War was fought from 1878 to 1888, between forces loyal to incumbent King Aweida of Nauru and those seeking to depose him in favour of a rival claimant. The war was preceded by the introduction of firearms to the island and its inhabitants, Nauruans, as a whole. For the majority of the war, the loyalists and the rebels found themselves in a stalemate, with one side controlling the northern and the other the southern part of the island.

Nauru, officially the Republic of Nauru and formerly known as Pleasant Island, is an island country and microstate in Micronesia, part of Oceania in the Central Pacific. Its nearest neighbour is Banaba of Kiribati, about 300 km (190 mi) to the east.