S. microcephalus binomial = Somniosus microcephalus binomial_authority = Bloch (Marcus Elieser Bloch) & Schneider (Johann Gottlob Schneider), 1801 range_map = Somniosus microcephalus distmap.png range_map_caption = Range of the Greenland shark synonyms =Squalus squatina (non Linnaeus (Carolus Linnaeus), 1758)Squalus carcharis (Gunnerus (Johann Ernst Gunnerus), 1776)Somniosus brevipinna (Lesueur, 1818)Squalus borealis (Scoresby, 1820)Squalus norvegianus (Blainville (Henri Marie Ducrotay de Blainville), 1825)Scymnus gunneri (Thienemann, 1828)Scymnus glacialis (Faber, 1829)Scymnus micropterus (Valenciennes (Achille Valenciennes), 1832)Leiodon echinatum (Wood, 1846)Somniosus antarcticus (Whitley, 1939)

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The Greenland shark, Somniosus microcephalus, also known as the sleeper shark, gurry shark, ground shark, grey shark, or by the Inuit Eqalussuaq, is a large shark native to the waters of the North Atlantic Ocean (Atlantic Ocean) around Greenland and Iceland. These sharks live farther north than any other shark species. They are closely related to the Pacific sleeper shark. This is one of the largest species of shark, of dimensions comparable to those of the Great White Shark. Large Greenland Sharks grow to 6.4 m (21 ft) and 1000 kg (2200 lbs), and possibly up to 7.3 m (24 ft). It rivals the Pacific sleeper shark (possibly up to 7 m or 23 ft long) as the largest species in the Somniosidae family. The greenland shark is known to be long-lived.