The Lau Islands (also called the Lau Group, the Eastern Group, the Eastern Archipelago) of Fiji are situated in the southern Pacific Ocean, just east of the Koro Sea. Of this chain of about one hundred islands and islets, about thirty are inhabited. The Lau Group covers a land area of 188 square miles (487 square km), and had a population of 10,683 at the most recent census in 2007. While most of the northern Lau Group are high islands of volcanic origin, those of the south are mostly carbonate low islands.

Administratively the islands belong to Lau Province.

The British explorer James Cook reached Vatoa in 1774. By the time of the discovery of the Ono Group in 1820, the Lau archipelago was the most mapped area of Fiji.

Political unity came late to the Lau Islands. Historically, they comprised three territories: the Northern Lau Islands, the Southern Lau Islands, and the Moala Islands. Around 1855, the renegade Tongan prince Enele Ma'afu conquered the region and established a unified administration. Calling himself the Tui Lau, or King of Lau, he promulgated a constitution and encouraged the establishment of Christian missions. The first missionaries had arrived at Lakeba in 1830, but had been expelled. The Tui Nayau, who had been the nominal overlord of the Lau Islands, became subject to Ma'afu.