Coquet Island is a small island of about 6 ha, situated 1.2 km off Amble on the Northumberland coast, northeast England.

It is owned by the Duke of Northumberland, and leased to the Royal Society for the Protection of Birds as a bird reserve, for its important seabird colonies.

The most numerous species is the Puffin, with over 18,000 pairs nesting in 2002, but the island is most important for the largest colony of the endangered Roseate Tern in Britain, which, thanks to conservation measures including the provision of nestboxes to protect the nests from gulls and bad weather, has risen to 70 pairs in 2003. Other nesting birds include Sandwich Tern, Common Tern, Arctic Tern, Kittiwake, Fulmar, three gull species, and Eider Duck.

Coquet Island also holds the remaining structure of a mediaeval monastery, which was largely incorporated into the 19th-century lighthouse and lighthouse keepers' cottages. The lighthouse, operated by Trinity House, is now automatic with no resident keeper, so the island is uninhabited in winter, but seasonal wardens are present throughout the summer to protect the nesting birds.

Landing on Coquet Island for the general public is prohibited, but Puffin Cruises from Amble sail close up to the island in good weather throughout the summer, allowing visitors to get good views of the Puffins and Roseate Terns.

See also:
The Farne Islands another important bird reserve about 30 km to the north