Sule Stack or Stack Skerry is an extremely remote island or stack in the North Atlantic off the north coast of Scotland. It is formed of Lewisian gneiss.

Sule Stack lies 49 kilometres (26+1⁄2 nautical miles) north of the Scottish mainland, and 66 km (35+1⁄2 nmi) west of the Orkney mainland, at grid reference HX561179. Sule Stack's sole neighbour, Sule Skerry, lies 10 km (5+1⁄2 nmi) northeast and the remote islands of Rona and Sula Sgeir lie further to the west. Sule Stack and Sule Skerry are home to thousands of gannets and as a result are listed as a special protection area; the island falls within the administrative region of the Orkney Islands.

Bird species nesting on the stack include:

• Razorbill Alca torda
• Atlantic puffin Fratercula arctica
• Fulmar Fulmarus glacialis
• Great black-backed gull Larus marinus
• Common shag Phalacrocorax aristotelis
• Black-legged kittiwake Rissa tridactyla
• Arctic tern Sterna paradisaea
• Northern gannet Morus bassanus
• Common guillemot Uria aalge

See also

• List of outlying islands of Scotland