Denis Island, Coral island in Seychelles, Indian Ocean.

Denis Island is a 1.4 km2 coral cay at the northern edge of the Seychelles bank, 60 km north of Mahé. A narrow band of white sand runs along its shoreline, and dark green trees, including coconut palms, takamaka and casuarina, cover the low interior. A small group of pale buildings stands among the trees, and an open-sided pavilion with a steep thatched roof of palm fronds bears a sign reading "DENIS ISLAND".

Denis de Trobriand, a French Navy officer, reached the island on 11 August 1773 and named it Isle Denis after himself, claiming it for France. He buried a bottle containing the document of ownership, making this the last island of the Seychelles main group to become an official French possession.

The island is named after Denis de Trobriand, the French Navy officer who explored it in 1773 and called it Isle Denis. A small chapel on the island is dedicated to St Denis, and the pavilion near the shore carries a sign reading "DENIS ISLAND". The island is privately owned and run as a resort with 23 guest chalets.

The island is reached by private flights or boat services from the main archipelago, with a grass airstrip for small aircraft. Access requires planning since transportation links are limited and weather-dependent.

Denis de Trobriand claimed the island for France on 11 August 1773 by burying a bottle containing a document of ownership, making it the last island of the Seychelles' main group to become an official French possession. The island was named after him.