Futuna Island is one of the two Hoorn Islands in Wallis and Futuna. It covers an area of 83 square kilometers. It is an island attached to the Wallis-Putuna Islands in the South Pacific Ocean, which is a self-governing foreign territory of France. It is called Futuna in French. Along with Wallace I. and Alofi I., it is the main island of the Wallis-Putuna Islands, forming the Putuna Islands (or the Hornet Islands). Both islands on the Putna Islands are the remains of old volcanoes, bordered by surrounded reefs.

The island is known as the place where Pierre Chanel, a French priest, was martyred in 1841 and became the only Catholic saint in the Polynesian region. It is also said that it was marked on a European map when Willem Schouten and Jacob Le Maire, a Dutch navigator traveling around the world in 1616, touched the island. They called the island Hoorn Eylanden after the city of Hoorn, where Schouten was born, and it was settled under the name of Hoorn.