The following is a list of Sites of Special Scientific Interest in the Western Isles North Area of Search. For Western Isles South see List of SSSIs in Western Isles South. For SSSIs elsewhere in Scotland, see List of SSSIs by Area of Search.
An environmentally sensitive area (ESA) is a type of designation for an agricultural area which needs special protection because of its landscape, wildlife or historical value. The scheme was introduced in 1987. Originally it was administered by Ministry of Agriculture, Fisheries and Food, then the Rural Development Service for the United Kingdom Governments Department for Environment, Food and Rural Affairs, and currently Natural England following successive re-organisation of the departments. In 2005 the scheme was superseded by Environmental Stewardship and closed to new entrants. Existing agreements remain active until they expire, meaning the designation will remain active until 2014.