| Stour Valley Community School136757 | Secondary | Good | 18.8% | 569 |
| Stowmarket High School145055 | Secondary | Good | 20.5% | 901 |
| Stowupland High School151384 | Secondary | Requires Improvement | 28.7% | 846 |
| Stradbroke Church of England Primary School145697 | Primary | Good | 13.4% | 112 |
| Stradbroke High School137901 | Secondary | Good | 21.6% | 353 |
| Stratford St Mary Primary School124675 | Primary | Good | 6.8% | 88 |
| Stutton Church of England Primary School145979 | Primary | Good | 19.7% | 76 |
| Suffolk New College130820 | 16 plus | — | — | — |
| Summerhill School124870 | Not applicable | — | — | 51 |
| Sunrise Academy149151 | Not applicable | Good | 68.6% | 51 |
| Sybil Andrews Academy140969 | Secondary | Good | 14.8% | 657 |
| Tattingstone Church of England Voluntary Controlled Primary School124744 | Primary | Good | 23.3% | 30 |
| The Albany150266 | Not applicable | Inadequate | 0.0% | 0 |
| The Albert Pye Community Primary School143492 | Primary | Good | 25.6% | 350 |
| The Ashley School137459 | Not applicable | Outstanding | 56.7% | 203 |
| The Beeches Community Primary School141849 | Primary | Good | 43.6% | 393 |
| The Bridge School147162 | Not applicable | Good | 44.7% | 257 |
| The Limes Primary Academy143671 | Primary | Good | 32.4% | 354 |
| The Oaks Primary School141842 | Primary | Outstanding | 33.1% | 449 |
| The Old School124885 | Not applicable | — | — | 47 |
| The Pines Primary School145031 | Primary | Good | 5.2% | 240 |
| The Ryes College143911 | Not applicable | — | — | 33 |
| The Willows Primary School144216 | Primary | Requires Improvement | 60.6% | 259 |
| Thomas Gainsborough School141639 | Secondary | Good | 20.4% | 1,603 |
| Thomas Mills High School & Sixth Form136782 | Secondary | Good | 18.9% | 1,056 |
| Thomas Wolsey Ormiston Academy137838 | Not applicable | Good | 32.0% | 105 |
| Thorndon Church of England Primary School149423 | Primary | Expected standard | 22.4% | 58 |
| Thurlow Voluntary Controlled Primary School124698 | Primary | Good | 14.3% | 77 |
| Thurston Church of England Primary Academy142562 | Primary | Good | 20.3% | 349 |
| Thurston Community College124802 | Secondary | Good | 19.0% | 1,512 |
| Tollgate Primary School140998 | Primary | Good | 29.3% | 437 |
| Trimley St Martin Primary School124614 | Primary | Good | 20.2% | 168 |
| Trimley St Mary Primary School124613 | Primary | Requires Improvement | 20.3% | 389 |
| Trinity Church of England Voluntary Aided Primary School140623 | Primary | Good | 21.5% | 177 |
| Tudor Church of England Primary School, Sudbury142026 | Primary | Good | 28.7% | 268 |
| University of Suffolk146206 | Not applicable | — | — | — |
| Waldringfield Primary School151189 | Primary | Requires Improvement | 21.7% | 69 |
| Walsham-le-Willows Church of England Voluntary Controlled Primary School124717 | Primary | Good | 17.1% | 117 |
| Warren School146431 | Not applicable | Good | 50.4% | 163 |
| Wells Hall Primary School144218 | Primary | Expected standard | 18.1% | 494 |
| Wenhaston Primary School144446 | Primary | Good | 19.4% | 93 |
| West Row Academy150276 | Primary | Requires Improvement | 18.8% | 208 |
| West Suffolk College130818 | 16 plus | — | — | — |
| Westbourne Academy139288 | Secondary | Inadequate | 38.6% | 989 |
| Westbridge Academy142808 | Not applicable | Good | 0.0% | 0 |
| Westfield Primary Academy140044 | Primary | Good | 21.6% | 425 |
| Westgate Community Primary School and Nursery124552 | Primary | Good | 27.6% | 301 |
| Westwood Primary School139804 | Primary | Good | 49.7% | 184 |
| Wetheringsett Church of England Primary School147575 | Primary | Good | 12.5% | 40 |
| Wetheringsett Manor School148058 | Not applicable | — | — | 102 |