Shannon Island (Danish: Shannon Ø) is a large island in Northeast Greenland National Park in eastern Greenland, to the east of Hochstetter Foreland, with an area of 1,466 km2 (566 sq mi).

The island is also home to many different types of animals such as polar bears, walruses, ravens, and oxen.

Most landmarks in the area were named by the Second German Polar Expedition under Carl Koldewey in 1869–70.

Between October 1943 and June 1944, the German meteorological expedition Bassgeiger operated under difficult conditions at Kap Sussi on Shannon.

The island is the site of several hunter's cabins and is reputed to have especially favorable ice conditions.