Darnley Island or Erub in the native Papuan language, Meriam Mir, is an island formed by volcanic action and situated in the eastern section of the Torres Strait, Queensland, Australia. It is one of the Torres Strait Islands and is located near the Great Barrier Reef and just south of the Bligh entrance. The town on the island is also called Darnley, but the locality is called Erub Island, both being within the local government area of Torres Strait Island Region. In the 2016 census, Erub Island had a population of 328 people.

The Torres Strait Islands are an archipelago of at least 274 small islands in the Torres Strait, a waterway separating far northern continental Australia's Cape York Peninsula and the island of New Guinea. They span an area of 48,000 km2 (19,000 sq mi), but their total land area is 566 km2 (219 sq mi).