Scharhörn is an uninhabited island in the North Sea belonging to the city of Hamburg, Germany. Scharhörn lies by the mouth of the Elbe, approximately 15 km northwest from Cuxhaven and 6 km northwest from the nearby island of Neuwerk. It is a part of Zone 1 of the Hamburg Wadden Sea National Park. Aside from a bird warden, the island has no permanent residents.
The island lies on a large sandbank together with the artificial island of Nigehörn. Though Scharhörn is generally flood-safe, the 6 m high banks of the island are not protected, so the island faces permanent loss of land on the western side as storm floods gradually shift the sandbank eastward.