S
- Sacriston Wood – Co Durham
- Saintbridge Balancing Pond
- Salary Brook
- Salcombe to Kingsbridge
- Salmon Pastures – Sheffield
- Saltersford Wood – Leicestershire
- Salthill Quarry – Ribble Valley, Lancs
- Saltway
- Saltwells – Dudley
- Sandall Beat
- Sands Bank
- Sandy Lane (Bramcote) – Broxtowe, Notts
- Sandy Point
- Sawcliffe Hill – North Lincolnshire
- Sayers Croft - Ewhurst, Surrey
- Scadbury Park
- Scalpcliffe Hill – East Staffordshire
- Scarr & Long Wood
- Scholes Coppice and Keppel's Field
- Scotch Gill Wood
- Scraptoft Harborough, Leicestershire
- Scratchwood and Moat Mount - Barnet, London
- Scrattons Ecopark & Extension
- Screech Owl
- Scrub Field
- Sculthorpe Moor
- Seaford Head
- Seasalter Levels
- Seaton Dunes and Common SSSI
- Seaton Marshes
- Seaton Valley North
- Seaton Valley South
- Seckar Wood
- Sellars Wood – Nottingham
- Selsdon Wood
- Seven Acres - Bolton
- Seven Fields
- Sharrow Cemetery – Sheffield
- Sharrow School Green Roof – Sheffield
- Sheepleas
- Sheepwash – Sandwell, West Midlands
- Sheffield General Cemetery
- Shelf Bank
- Shere Woodlands
- Sherrardspark Wood
- Sherwood Heath
- Shibden Park & Cunnery Wood
- Shibdon Pond
- Shide Chalk Pit
- Shirebrook Valley – Sheffield
- Shire Oak Park – Walsall
- Shoal Hill – South Staffordshire
- Shoeburyness Old Rangers
- Shoreham Beach
- Shrubhill Common
- Sibden Hill and Batts Copse
- Siddick Ponds – Allerdale, Cumbria
- Siding Lane Woodland
- Sigglesthorne Station – East Riding of Yorkshire
- Silica Lodge – North Lincolnshire
- Silver Street
- Silverlink Biodiversity Park
- Sinfin Moor – Derby
- Sir Joseph Hood Memorial Wood
- Sladers Leigh
- Slop Bog
- Smallbrook Meadows
- Smestow Valley – Wolverhampton
- Smiths Pool – Stoke-on-Trent
- Smith's Wood – Solihull, West Midlands
- Smithurst Meadows – Broxtowe, Notts
- Smockhill Common
- Snakemoor
- Snibston Grange – Leicestershire
- Snipe Dales – Lincolnshire
- Sot's Hole with Bluebell Wood – Sandwell, West Midlands
- Sound Common
- South Bank of The Swale
- South Landing – East Riding of Yorkshire
- South Norwood Country Park
- South Norwood Country Park - Extension
- South Staffordshire Railway Walk – East Staffordshire and South Staffordshire
- South Stanley Woods – Derwentside, Co Durham
- South Swale
- South Taunton Streams
- South Thoresby Warren – Lincolnshire
- South Walsham Fen
- South Wood
- Southend on Sea Foreshore
- Southern Washlands
- Southorpe, Hornsea – East Riding of Yorkshire
- Southrepps Common
- Southway Valley
- Southwell Trail
- Southwood Open Space
- Sparrow Wood
- Spencer Road Wetlands
- Spennells Valley
- Spion Kop Cemetery – Hartlepool
- Spring Lane Meadows
- Spring Wood/Millennium Wood, Belstead
- Springfield Park, Hackney – Hackney
- St Aidan's - West Yorkshire
- St Chad's Water – Erewash, Derbyshire
- St Denis Church (footprint of Church only)
- St Gothian Sands
- St Helen's Wood
- St John's Wood Church Grounds
- St Mary's Island, Tyne and Wear – North Tyneside
- St Nicholas Fields - York
- St Wulstan's
- Staffhurst Wood, Lingfield
- Stainton Quarry – Middlesbrough
- Standhills Road, Kingswinford
- Stanley Bank Meadow
- Stanley Marsh
- Stanmer Park /Coldean
- Stanmore Common
- Stanmore Country Park
- Stanney Woods – Cheshire West and Chester
- Stanpit Marsh, Christchurch
- Stanton Gate – Erewash, Derbyshire
- Stanton Park
- Stanton's Pit - Lincolnshire
- Stapleford Hill Woodland – Broxtowe, Notts
- Station Burn
- Stave Hill Ecological Park
- Steamer Point
- Steeley Hill, Cornsay Quarry – Co Durham
- Steeple Woodland Nature Reserve
- Stenner Woods and Milgate Fields, Didsbury – Manchester
- Stephens Castle
- Stillington Forest Park – Stockton-on-Tees
- Stockers Lake
- Stockton Railway Cutting – Warwickshire
- Stockwood Open Space
- Stoke Floods – Coventry
- Stoke Park Wood
- Stokes Field
- Stone Meadows – Stafford
- Stonebridge Meadows – Coventry
- Stonehill Down - Dorset
- Stony Clouds – Erewash, Derbyshire
- Stour Valley
- Stover
- Street Heath
- Stubbins Park – Chinley Buxworth and Brownside, Derbyshire
- Sudbury Common Lands
- Sue Godfrey Nature Park
- Sugar Loaf Hill and Saltern Cove
- Sugar Mill Ponds – East Riding of Yorksire
- Sugley Dene
- Summer Leys
- Summerfields Wood
- Summerhill – Hartlepool
- Sunnybank – Sheffield
- Sunny Bank Ponds
- Sunnydale Park – Derby
- Sunnyhurst Woods
- Sunrise Hill – Nottingham
- Sutcliffe Park
- Sutherland Grange
- Sutton Bonnington Spinney & Meadows
- Sutton Ecology Centre Grounds
- Swains, Taunton – Taunton Deane, Somerset
- Swallow Pond & Plantation
- Swallowfield Meadow
- Swanholme Lakes – City of Lincoln
- Swanpool
- Swift Valley
- Sydenham Hill Wood
Read more about this topic: List Of Local Nature Reserves In England