Gairo, Gàiru in Sardinian, is a comune in the Province of Nuoro in the Italian region Sardinia, located about 80 kilometres northeast of Cagliari and about 30 kilometres southwest of Tortolì. As of 31 December 2004, it had a population of 1,643 and an area of 78.4 square kilometres. Gairo was originally constructed on unstable ground. Starting in 1951, buildings began to collapse. This led to the abandonment of the original location and re-building at an uphill location.