Colsay is an uninhabited island off the South West coast of Mainland, Shetland. Fora Ness lies to the south, across the Muckle Sound. The highest elevation is 44 metres (144 ft), and there is an ancient cairn on the summit.

It is in Dunrossness parish, 8 miles (13 km) NNW of Sumburgh Head. It used to pasture a good many sheep mostly Cheviot/Shetland cross breeds, which were transported to the island by small boats, called Yoals, from the nearby Spiggie Beach, and landed at the only decent landing place on the island, called the "Owsin Gaet".

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v t e Shetland
Inhabited islands	Mainland Bressay Burra East Burra West Burra Fair Isle Fetlar Foula Muckle Roe North Isles Out Skerries Papa Stour Trondra Unst Vaila Whalsay Yell
Other islands	Balta Bigga Brother Isle Colsay Hascosay Hildasay Lamba Linga, Bluemull Sound Linga, Busta Voe Linga (near Vementry) Linga, Vaila Sound Linga, Yell Sound Mousa Noss Oxna Papa Papa Little Samphrey South Havra St Ninian's Isle Uyea, Northmavine Uyea, Unst Vementry Ve Skerries West Linga
Towns and villages	Lerwick Aith Baltasound Bigton Bixter Brae Cunningsburgh Grutness Gulberwick Gutcher Haroldswick Hillswick Levenwick Mid Yell Mossbank North Roe Ollaberry Quarff Sandwick Scalloway Symbister Toab Toft Ulsta Uyeasound Vidlin Voe Walls Weisdale Whiteness
Mainland Parishes	Delting Dunrossness Lerwick Nesting Northmavine Sandsting Tingwall Walls and Sandness
Insular Parishes	Bressay Fetlar Unst Yell
Maritime features	Balta Sound Bluemull Sound Burra Voe Busta Voe Calder's Geo Ronas Voe St Magnus Bay Sullom Voe West Voe of Sumburgh Yell Sound
Extreme points (N S E W)	Out Stack The Skerry, off Fair Isle Bound Skerry Waster Hoevda, Foula
Topics	Animal breeds Etymology History Prehistory

59°57′06″N 1°21′23″W / 59.95167°N 1.35639°W / 59.95167; -1.35639