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- B: A to Z of records
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- D: A to Z of records
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- Saxilby C of E Primary School
- Scamblesby C of E Primary School
- Scampton C of E Primary School
- Scampton Pollyplatt Primary School
- Scothern Ellison Boulters C of E Academy
- Scotter Primary School
- Shepeau Stow Primary School
- Sibsey Free Primary School
- Skegness Academy
- Skegness Beacon Primary Academy
- Skegness Grammar School
- Skegness Infant Academy
- Skegness Junior Academy
- Skegness Seathorne Primary School
- Skegness The Richmond Primary Academy
- Skellingthorpe St Lawrence C of E Primary School
- Skellingthorpe The Holt Primary School
- Sleaford Carre's Grammar School
- Sleaford Church Lane Primary School
- Sleaford Kesteven and Sleaford High School Selective Academy
- Sleaford Our Lady of Good Counsel Catholic Primary School
- Sleaford St Botolph's C of E Primary School
- Sleaford St George's Academy
- Sleaford The William Alvey C of E School
- South Hykeham School
- South Rauceby Ash Villa School
- South Witham Community Primary School
- Spalding Academy
- Spalding Grammar School
- Spalding High School
- Spalding Monkshouse Primary Academy
- Spalding Parish C of E Day School
- Spalding Primary School
- Spalding Springwell Alternative Academy
- Spalding St John The Baptist C of E Primary School
- Spalding St Norbert's Catholic Voluntary Academy
- Spalding St Paul's Community Primary and Nursery School
- Spalding Tulip Academy – Springview Campus
- Spalding Tulip Academy – Waterside Campus
- Spalding Wygate Park Academy
- Spilsby Eresby School
- Spilsby King Edward VI Academy
- Spilsby Primary School
- Spilsby Woodlands Academy
- Stamford St Augustine's Catholic Primary School
- Stamford St George's C of E Primary School
- Stamford St Gilbert's C of E Primary School
- Stamford The Bluecoat School
- Stamford The Malcolm Sargent Primary School
- Stamford Welland Academy