Lundy is an English island in the Bristol Channel. It forms part of the district of Torridge in the county of Devon.

About 3 miles (5 kilometres) long and 5/8 mi (1 km) wide, Lundy has had a long and turbulent history, frequently changing hands between the British crown and various usurpers. In the 1920s, one self-proclaimed king, Martin Harman, tried to issue his own coinage and was fined by the House of Lords. In 1941, two German Heinkel He 111 bombers crash landed on the island, and their crews were captured.

In 1969, Lundy was purchased by British millionaire Jack Hayward, who donated it to the National Trust. It is now managed by the Landmark Trust, a conservation charity that derives its income from day trips and holiday lettings, most visitors arriving by boat from Bideford or Ilfracombe. A local tourist curiosity is the special "Puffin" postage stamp, a category known by philatelists as "local carriage labels", a collectors' item

As a steep, rocky island, often shrouded by fog, Lundy has been the scene of many shipwrecks, and the remains of its old lighthouse installations are of both historic and scientific interest. Its present-day lighthouses are fully automated, one of which is solar-powered. Lundy has a rich bird life, as it lies on major migration routes, and attracts many vagrant as well as indigenous species. It also boasts a variety of marine habitats, with rare seaweeds, sponges and corals. In 2010, the island became Britain's first Marine Conservation Zone.

Lundy has 23 holiday properties, sleeping between one and 14 people. These include a lighthouse, a castle and a Victorian mansion. Many of the buildings are constructed from the island's granite.

The island also has a campsite, at the south of the island in the field next to the shop. It has hot and cold running water, with showers and toilets, in an adjacent building.

The island is popular with rock climbers, having the UK's longest continuous slab climb, "The Devil's Slide".

Lundy has been designated by Natural England as national character area 159, one of England's natural regions.