The Hoorn Islands (also Futuna Islands, French: Îles Horne) are one of the two island groups of which the French overseas collectivity (collectivité d'outre-mer, or COM) of Wallis and Futuna is geographically composed. The aggregate area is 115 km², and the population 4,873 (census of 2003).

The archipelago was named by the Dutch navigators Willem Schouten and Jacob Le Maire, who, in 1616, became the first Europeans to visit the islands. They named it after the Dutch city of Hoorn, from which their expedition had started. They had previously rounded and named Cape Horn on the same voyage; Schouten had been born in Hoorn.

Geographically, there are two islands:

• Futuna Island (in the northwest) (83 km², pop. 4871)
• Alofi Island (in the southeast) (32 km², pop. 2)

Administratively, the Hoorn Islands encompass two of Wallis and Futuna's three royal chiefdoms, namely:

• Tu`a (Alo), which comprises Alofi Island and the eastern part of Futuna Island (area 85 km², pop. 2993)
• Sigave (Singave), which comprises the western third of Futuna Island (area 30 km², pop. 1880)

(The third royal chiefdom is Uvea.)

• Wallis Island (Uvea)