Clairinsh or Clairinch (Scottish Gaelic: Clàr-Innis) is an island in Loch Lomond, central Scotland.

[7] On the island, the head of an iron ring-headed pin (a La Tène Culture#Periodization I (c) type) has been discovered.

[4] Roman pottery has been found in the remnants of a crannog (a man-made artificial island) 62 m off the northern end of Clairinch, called "Keppinch" (Scottish Gaelic: Ceap-Innis) or "The Kitchen".

[10] In 1934, William George Buchanan (1865-1939) (who made his fortune in the Chilean nitrate industry) purchased the island.

In 1958, Clairinsh was declared as the first part of a National Nature Reserve under an agreement with the landowner.