| St John's CofE Primary School117460 | Primary | Good | 9.2% | 224 |
| St John's Church of England Infant and Nursery School147818 | Primary | Good | 12.7% | 191 |
| St John the Baptist Voluntary Aided Church of England Primary School117432 | Primary | Good | 20.6% | 155 |
| St John Roman Catholic Primary School138316 | Primary | Good | 14.9% | 161 |
| St John Fisher Catholic Primary School, a Voluntary Academy148990 | Primary | Good | 17.2% | 134 |
| St John Catholic Primary School146859 | Primary | Good | 16.8% | 107 |
| St Ippolyts Church of England Aided Primary School117440 | Primary | Good | 11.8% | 161 |
| St Hilda's School117627 | Not applicable | — | — | 134 |
| St Helen's Church of England Primary School117462 | Primary | Good | 8.7% | 184 |
| St Giles' CofE Primary School117564 | Primary | Needs attention | 32.5% | 83 |
| St George's School138356 | Secondary | Outstanding | 4.5% | 1,351 |
| St Francis College117613 | Not applicable | — | — | 264 |
| St Elizabeth's School117665 | Not applicable | Good | 14.1% | 64 |
| St Elizabeth's Centre132015 | Not applicable | — | — | — |
| St Edmund's College117633 | Not applicable | — | — | 684 |
| St Dominic Catholic Primary School151499 | Primary | Outstanding | 2.6% | 232 |
| St Cuthbert Mayne Voluntary Catholic Junior Academy150619 | Primary | Good | 10.5% | 247 |
| St Cross Catholic Primary School148496 | Primary | Good | 5.0% | 201 |
| St Columba's College117638 | Not applicable | — | — | 822 |
| St Clement Danes School136901 | Secondary | Outstanding | 5.4% | 1,585 |
| St Christopher School117612 | Not applicable | — | — | 492 |
| St Catherine's Hoddesdon CofE Primary School133773 | Primary | Good | 21.9% | 383 |
| St Catherine's Church of England Primary School117410 | Primary | Good | 11.7% | 415 |
| St Catherine of Siena Catholic Primary School138288 | Primary | Good | 16.4% | 268 |
| St Bartholomew's Church of England Voluntary Aided Primary School, Wigginton117463 | Primary | Good | 11.4% | 105 |
| St Augustine's Catholic Primary School148494 | Primary | Good | 6.7% | 238 |
| St Anthony's Catholic Primary School117495 | Primary | Expected standard | 11.2% | 448 |
| St Andrew's Church of England Voluntary Controlled Primary School117407 | Primary | Good | 13.8% | 193 |
| St Andrew's Church of England Voluntary Aided Primary School, Hitchin117467 | Primary | Outstanding | 6.4% | 234 |
| St Andrew's CE Primary School and Nursery117444 | Primary | Good | 7.1% | 213 |
| St Albans School117647 | Not applicable | — | — | 883 |
| St Albans Independent College134087 | Not applicable | — | — | 70 |
| St Albans High School for Girls117617 | Not applicable | — | — | 1,106 |
| St Albans Girls' School137339 | Secondary | Outstanding | 11.6% | 1,423 |
| St Alban & St Stephen Catholic Primary School & Nursery151983 | Primary | Good | 8.4% | 410 |
| St Adrian Roman Catholic Primary School117470 | Primary | Good | 11.7% | 194 |
| Springmead Primary School145409 | Primary | Good | 24.2% | 248 |
| Spellbrook CofE Primary School117405 | Primary | Expected standard | 16.8% | 105 |
| Southfield School130362 | Not applicable | Good | 48.1% | 108 |
| South Hill Primary School117110 | Primary | Good | 23.0% | 417 |
| Skyswood Primary & Nursery School148875 | Primary | Outstanding | 0.9% | 230 |
| Sir John Lawes School137270 | Secondary | Outstanding | 9.7% | 1,373 |
| Simon Balle All-Through School140294 | All-through | Outstanding | 9.8% | 1,617 |
| Sherrardswood School117622 | Not applicable | — | — | 445 |
| Sheredes Primary School117353 | Primary | Outstanding | 6.2% | 456 |
| Shepherd Primary117096 | Primary | Good | 21.7% | 179 |
| Shephalbury Park Primary School135084 | Primary | Good | 24.0% | 228 |
| Shenley Primary School117150 | Primary | Good | 38.8% | 119 |
| Sauncey Wood Primary School117102 | Primary | Good | 22.4% | 147 |
| Sarratt Church of England Primary School146723 | Primary | Good | 8.6% | 163 |