Sl
- Slades Green
- Slaggan
- Slaggyford
- Slaidburn
- Slains
- Slains Castle
- Slains Castle
- Slains Old Castle
- Slaithwaite
- Slaley
- Slamannan
- Slapton
- Slapton
- Slapton
- Slapton Sands
- Slate Island
- Slateford
| - Slaugham
- Slaughter
- Slaughterford
- Slawston
- Sleach Water
- Sleaford
- Sleat
- Sleddale
- Sledmere
- Sledway
- Sledway
- Sleightholme
- Sleights
- Slemish Hills
- Slemish Mountain
- Sliabh Gaoif
- Sliabh Gaoil
| - Slickly
- Sliddery
- Sliddery Water
- Slieve Ban
- Slieve Beagh
- Slieve Bignian
- Slieve Bingian
- Slieve Binnian
- Slieve Croob
- Slieve Crool
- Slieve Donard
- Slieve Gallion
- Slieve Gullion
- Slieveanorra
- Slievelamagan
- Slievemartin
- Slievemore
| - Slievemore
- Slievenanee
- Sligga Skerry
- Slimbridge
- Slindon
- Slindon
- Slinfold
- Slingsby
- Slioch
- Slioch
- Slioga Skerry
- Slitrig Water
- Slochd Maol Doiridh
- Slochd Mhaol Doraidh
- Slough
- Slough
- Slough-na-more
- Sluddaw
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