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In England, Sites of Special Scientific Interest (SSSIs) are designated by Natural England, which is responsible for protecting England's natural environment. Designation as an SSSI gives legal protection to the most important wildlife and geological sites. As of March 2019, there are 65 sites designated in East Sussex, 45 of which have been designated for their biological interest, 15 for their geological interest, and 5 for both biological and geological interest.

Six sites are Special Areas of Conservation, two are Special Protection Areas, two are Ramsar sites, twenty are Geological Conservation Review sites, ten are Nature Conservation Review sites, five are national nature reserves, ten are local nature reserves, six are in Areas of Outstanding Natural Beauty, two are on the Register of Historic Parks and Gardens and three contain scheduled monuments. Nine sites are managed by the Sussex Wildlife Trust and one by the Royal Society for the Protection of Birds.

East Sussex is a county in South East England. It is bordered by Kent to the north-east, West Sussex to the west, Surrey to the north and the English Channel to the south. It has an estimated population of 757,600 within an area of , therefore making it the 28th largest ceremonial county in the United Kingdom.

Interest B = site of biological interest G = site of geological interest Public access FP = access to footpaths through the site only NO = no public access to site PL = public access at limited times PP = public access to part of site YES = public access to all or most of the site

Other classifications AONB = Area of Outstanding Natural Beauty GCR = Geological Conservation Review LNR = Local nature reserve NCR = Nature Conservation Review site NNR = National nature reserve NT = National Trust Ramsar = Ramsar site, an internationally important wetland site RHPG= Register of Historic Parks and Gardens of Special Historic Interest in England RSPB = Royal Society for the Protection of Birds SAC = Special Area of Conservation SM = Scheduled monument SPA = Special Protection Area under the European Union Directive on the Conservation of Wild Birds SWT = Suffolk Wildlife Trust WWT = Wildfowl & Wetlands Trust

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