Quatre is one of the Grenadines islands which lie between the Caribbean islands of Saint Vincent and Grenada. It is part of the nation of Saint Vincent and the Grenadines.

On March 30, 2024, American YouTuber MrBeast released a video on his channel titled 7 Days Stranded On An Island, where he and his friends spent seven days on the island.

Quatre island lies southwest of Petit Nevis Island, and south of the larger island Bequia and north of Canouan. About 8 km (5.0 mi) away, to the southeast is popular with tourists island Mustique. It has an area of 1.52 km (0.59 sq mi), a length of 3 km (1.9 mi), and a width of 250 to 950 m (820 to 3,120 ft). The highest point reaches 146 m (479 ft) above sea level, and the average height is 38 m (125 ft).

Until the end of Seven Years' War Quatre island was French colony, along with the other islands of this region. In 1763 they all were ceded to England.

For more than a hundred years, the island has been owned by the Mitchell family, former captains who will continue to keep a part of the island for themselves after sale of big part of island for resort development.

The island was formerly home to white cedar (Tabebuia heterophylla), which was used for shipbuilding.