Starting with S
| Station name | Area | |
|---|---|---|
| Sabras Radio | Leicester | |
| Sai Global Harmony | AfriStar - All | |
| Saint FM | Maldon District | |
| Radio St Helier | St. Helier Hospital, Carshalton | |
| Salford City Radio | Salford | |
| Sandwell Hospital Radio | Sandwell District Hospital, Sandwell Maternity Unit, Rowley Regis Hospital | |
| Scam Radio | Suffolk New College, Ipswich | |
| 97.5 Scarlet FM | Llanelli | |
| Radio Scilly | Isles of Scilly | |
| BBC Radio Scotland | Scotland | |
| Scunthorpe Hospital Radio | ||
| 105.3 Seaside FM | Withernsea | |
| Seaside Hospital Radio | Worthing Hospital and Southlands Hospital, Shoreham-by-Sea | |
| BBC Radio 7 | UK | |
| Seven FM | Ballymena | |
| 92.1 7 Waves Community Radio | Wirral | |
| 107.1 The Severn | Oswestry & North Shropshire | |
| 106.5 The Severn | Shrewsbury | |
| Shannonside 104FM | Longford, Roscommon and South Leitrim | |
| BBC Sheffield | South Yorkshire, Chesterfield, Bassetlaw | |
| 102.4 Shine FM | Banbridge | |
| Shock FM | University of Falmouth | |
| Shock Radio | Salford | |
| Shout Radio | Livepool John Moores University | |
| BBC Shropshire | Shropshire, Digital - Wolverhampton | |
| Shetland Islands Broadcasting Company | Shetland | |
| Signal 1 | Staffordshire and Cheshire | |
| Signal 2 | Staffordshire and Cheshire | |
| Cheshire's Silk 106.9 | Macclesfield and East Cheshire | |
| Sine FM | Doncaster central districts | |
| Siren FM | Lincoln | |
| Six FM | Mid-Ulster | |
| Radio Six International | 24 hours a day on the Internet and daily on 88.5FM to Tawa, New Zealand | |
| BBC 6 Music | UK | |
| Radio Skerne | Darlington Memorial Hospital | |
| Sky Channel Line-Up | UK | |
| Sky User Radio | ||
| 102.5 FM Skyline | Eastleigh | |
| SkyWave Radio | Cable - Sussex Coast | |
| Smash Hits! Radio | UK | |
| Smoke Radio | University of Westminster | |
| 102.2 Smooth Radio (London) | Greater London | |
| 100.4 Smooth Radio (North West) | North West England | |
| 105.7 Smooth Radio (West Midlands) | West Midlands | |
| 106.6 Smooth Radio (East Midlands) | East Midlands, Digital - Nottingham | |
| 105.2 Smooth Radio (Scotland) | Glasgow, Digital - Central Scotland | |
| 97.5 & 107.7 Smooth Radio (North East) | North East England, Digital - Yorkshire | |
| Solar Radio | UK | |
| BBC Solent | South Hampshire and Dorset | |
| BBC Somerset | Somerset | |
| Sound Radio 1503 AM | East London | |
| 1431AM Source Radio | Coventry University | |
| South East Radio | Wexford | |
| South Tipperary General Hospital Radio | South Tipperary | |
| Hospital Radio South Tyneside | South Tyneside District Hospital | |
| Southampton HBA | Southampton Hospitals, Southampton; Digital - South Hampshire | |
| Southend Hospital Radio | Southend Hospital | |
| Southend Radio 105.1 | Southend | |
| Sovereign FM | Eastbourne and Hailsham | |
| SPAR Live | SPAR Stores | |
| Spark FM | Sunderland | |
| Spectrum Radio (AM) | Greater London | |
| Spectrum Radio (Digital Channel 1) | Greater London | |
| Speysound Radio | Badenoch & Strathspey | |
| Spin 1038 | Dublin | |
| Spin South West | South West Ireland | |
| 102 Spire FM | Salisbury | |
| Spirit FM | Chichester, Bognor Regis & Littlehampton | |
| Splash FM | Worthing, Littlehampton and Shoreham | |
| Radio St Austell Bay | St Austell, Cornwall | |
| St Ita's Hospital Radio | Portrane | |
| Star 107.5 | Gloucestershire and The Malverns | |
| Star Radio (Cambridge and Ely) | Cambridge, Ely and Littleport | |
| Star Radio - Bristol | Bristol | |
| Star Radio (Darlington) | Darlington | |
| Star Radio (Durham) | Durham, Chester le Street, Houghton le Spring, Stanley & Consett. | |
| Star Radio (Northallerton) | Bedale, Thirsk and Northallerton | |
| 107.7 Star Radio | Weston-super-Mare and North Somerset | |
| Starpoint Radio | UK | |
| BBC Stoke | Stoke-on-Trent and Surrounding Areas | |
| Stoke Mandeville Hospital Radio | Stoke Mandeville Hospital | |
| Storm 87.7FM | Prifysgol Bangor University | |
| 97.2 Stray FM | Harrogate | |
| Streaming Radio | ||
| Stroud FM | Stroud | |
| Subcity Radio | University of Glasgow | |
| BBC Suffolk | Suffolk | |
| Sukh Sagar Radio | UK | |
| 103.4 Sun FM | Sunderland | |
| Sunny Govan Radio | Glasgow | |
| Sunrise Radio (London) | Greater London, Digital - Various | |
| Sunrise Radio (Yorkshire) | Bradford, Digital - Bradford and Huddersfield | |
| Sunshine 1530 | Herefordshire and Worcestershire | |
| Sunshine 855 | South Shropshire, North Herefordshire, North Worcestershire, England/Wales Borders | |
| Sunshine Radio (FM) | Herefordshire & Monmouthshire | |
| SunTalk | Internet | |
| Sure Radio | University of Sheffield | |
| Surge | Southampton University | |
| BBC Surrey | Surrey, North East Hampshire and North Sussex | |
| BBC Sussex | West, mid and East Sussex, Digital - Sussex Coast | |
| Radio City Swansea | ||
| Swansea Sound | Swansea and South West Wales | |
| Swindon 105.5 | Swindon | |
| The System | AfriStar - All |
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