兰迪岛（Lundy）是英国布里斯托尔湾中最大的岛屿，离岸约19公里。

兰迪岛上有独特的植物群和动物群，是英国第一个法定海洋自然保护区。

Lundy (Welsh:Ynys Wair) is the largest island in the Bristol Channel. It lies 12 miles (19 km) off the coast of Devon, England, about a third of the distance across the channel from Devon, England to South Wales. Lundy gives its name to a British sea area and is one of the islands of England. Lundy has been designated by Natural England as national character area 159, one of England's natural regions.