- Santander - Saffron Walden
- Santander - Sale
- Santander - Salford
- Santander - Salisbury
- Santander - Saltcoats
- Santander - Scarborough
- Santander - Scunthorpe
- Santander - Seaford
- Santander - Selby, 15, Gowthorpe
- Santander - Selby, 22, Market Cross Shopping Cent
- Santander - Selsdon
- Santander - Sevenoaks
- Santander - Shaftesbury
- Santander - Sheffield, 27, The Arcade, Meadowhall Centre
- Santander - Sheffield, 34-36, Fargate
- Santander - Sheffield, University of Sheffield Students Union, Western Ba
- Santander - Shepherds Bush
- Santander - Shipley
- Santander - Shirley, 203, Stratford Road
- Santander - Shirley, 223, Stratford Road
- Santander - Shoreham by Sea
- Santander - Shrewsbury, Crown House, St Marys Street
- Santander - Sidcup
- Santander - Sidmouth
- Santander - Sittingbourne
- Santander - Skipton
- Santander - Slough
- Santander - Solihull
- Santander - South Harrow
- Santander - South Kensington, 90, Old Brompton Road
- Santander - South Kensington, Santander, Room 213, The Walkway, Main Island Site
- Santander - South Norwood
- Santander - South Shields
- Santander - South Woodham Ferrers
- Santander - Southall
- Santander - Southampton, 1, Shirley High St
- Santander - Southampton, 434, Bitterne Road, Bitterne Vi
- Santander - Southampton, 57, Above Bar
- Santander - Southampton, The Gower Building, 108, Burge
- Santander - Southend-on-Sea, 9, London Road
- Santander - Southgate
- Santander - Southport
- Santander - Southsea
- Santander - Spalding
- Santander - St Albans
- Santander - St Andrews, 145, Market Street
- Santander - St Andrews
- Santander - St Austell
- Santander - St Helens
- Santander - St Johns Wood
- Santander - St Neots
- Santander - Stafford
- Santander - Staines
- Santander - Stamford
- Santander - Stanley
- Santander - Stanmore, 17, Church Road
- Santander - Stanmore, 33, Church Road
- Santander - Stepney
- Santander - Stevenage
- Santander - Stirling, 49-51, Port Street
- Santander - Stirling, Andrew Miller building, Stirling University
- Santander - Stockport
- Santander - Stockton On Tees
- Santander - Stoke Newington
- Santander - Stoke-On-Trent
- Santander - Stokesley
- Santander - Stourbridge
- Santander - Stowmarket
- Santander - Strabane
- Santander - Stranraer
- Santander - Stratford, 38, The Broadway
- Santander - Stratford, 70, The Broadway
- Santander - Stratford Upon Avon
- Santander - Streatham
- Santander - Stroud
- Santander - Sudbury
- Santander - Sunderland
- Santander - Surbiton
- Santander - Surrey Quays
- Santander - Sutton
- Santander - Sutton Coldfield
- Santander - Swadlincote
- Santander - Swansea
- Santander - Swansea, Room 032 Fulton House ,singleton Park
- Santander - Swindon
- Santander - Swinton
- Santander - Swiss Cottage
- Santander - Sydenham
- Santander - Syston