- Saddlescombe, Mid Sussex District, West Sussex
- Salehurst, Rother District, East Sussex
- Saltdean, The City of Brighton and Hove
- Salvington, Worthing District, West Sussex
- Sayers Common, Mid Sussex District, West Sussex
- Scaynes Hill, Mid Sussex District, West Sussex
- Scotney Castle, Lamberhurst, Kent
- Seaford, Lewes District, East Sussex
- Sedgwick Castle and Park, Horsham District, West Sussex
- Sedlescombe, Rother District, East Sussex
- Sele Priory, Upper Beeding, Horsham District, West Sussex
- Selham, Chichester District, West Sussex
- Selmeston, Wealden District, East Sussex
- Selsey, Chichester District, West Sussex
- Selsfield Common, Turners Hill, West Sussex
- Seven Sisters, Sussex heritage coast
- Sharpthorne, Mid Sussex District, West Sussex
- Sheffield Park, Wealden District, East Sussex
- Shermanbury, Horsham District, West Sussex
- Shipley, Horsham District, West Sussex
- Shoreham, Old Shoreham, New Shoreham, Adur District, West Sussex
- Shulbrede Priory, Linchmere, West Sussex
- Sidlesham, Chichester District, West Sussex
- Singlecross, The hundred of
- Singleton
- Singleton, Chichester District, West Sussex
- Slaugham, Mid Sussex District, West Sussex
- Slindon, Arun District, West Sussex
- Slinfold, Horsham District, West Sussex
- Sompting, Adur District, West Sussex
- South Bersted, Arun District, West Sussex
- South Downs
- South Harting, Chichester District, West Sussex
- South Malling, Lewes District, East Sussex
- South Stoke, Arun District, West Sussex
- Southbourne, Chichester District, West Sussex
- Southease, Lewes District, East Sussex
- Southwater, Horsham District, West Sussex
- Southwick, Adur District, West Sussex
- St Leonard's Forest, Horsham District, West Sussex
- St Leonards-on-Sea, Hastings District, East Sussex
- Standen, East Grinstead, Mid Sussex District, West Sussex
- Stane Street, Roman road from London to Chichester
- Stanmer, The City of Brighton and Hove
- Stansted Park, Stoughton, West Sussex
- Staplefield, Mid Sussex District, West Sussex
- Stedham, Chichester District, West Sussex
- Steyning, Horsham District, West Sussex
- Steyning: Steyning Grammar School
- Stonegate, Rother District, East Sussex
- Stopham, Chichester District, West Sussex
- Storrington, Horsham District, West Sussex
- Stoughton, Chichester District, West Sussex
- Streat, Lewes District, East Sussex
- Sullington, Horsham District, West Sussex
- Sussex
- Sussex Coast
- Sussex Weald
- Sutton, Chichester District, West Sussex
- Swanborough, The hundred of
