| Grasby All Saints Church of England Primary School120571 | Primary | Good | 14.6% | 89 |
| Great Ponton Church of England School120602 | Primary | Good | 40.0% | 55 |
| Great Steeping Primary School120451 | Primary | Requires Improvement | 30.8% | 81 |
| Greenfields Academy139316 | Not applicable | Good | 59.2% | 76 |
| Greenwich House School120743 | Not applicable | — | — | 95 |
| Grimoldby Primary School120684 | Primary | Good | 20.8% | 207 |
| Halton Holegate CofE Primary School120573 | Primary | Good | 43.5% | 62 |
| Handel House Preparatory School120733 | Not applicable | — | — | 44 |
| Hartsholme Academy146559 | Primary | Good | 45.2% | 346 |
| Haven High Academy138754 | Secondary | Inadequate | 40.6% | 1,229 |
| Hawthorn Tree School120424 | Primary | Good | 35.2% | 364 |
| Heckington House School145932 | Not applicable | — | — | 28 |
| Heckington St Andrew's Church of England School120526 | Primary | Good | 28.6% | 161 |
| Heighington Millfield Primary Academy137201 | Primary | Good | 12.0% | 209 |
| Helpringham Primary Academy151091 | Primary | Good | 36.4% | 83 |
| Hemswell Cliff Primary School120491 | Primary | Good | 63.9% | 36 |
| Hogsthorpe Primary Academy138749 | Primary | Good | 41.3% | 46 |
| Holbeach Bank Primary Academy145734 | Primary | Good | 47.6% | 84 |
| Holbeach Primary Academy141260 | Primary | Good | 38.2% | 309 |
| Holton Le Clay Infant School120453 | Primary | Good | 18.3% | 71 |
| Holton Sleaford Independent School148356 | Not applicable | — | — | 80 |
| Holton-le-Clay Junior School120497 | Primary | Good | 29.3% | 99 |
| Horncastle Primary School148713 | Primary | Good | 40.0% | 417 |
| Huntingtower Community Primary Academy139618 | Primary | Needs attention | 37.9% | 417 |
| Huttoft Primary & Nursery School138808 | Primary | Good | 33.8% | 147 |
| Illuminate You152477 | Not applicable | — | — | — |
| Ingham Primary School120454 | Primary | Good | 13.8% | 87 |
| Ingoldmells Academy138444 | Primary | Good | 71.6% | 112 |
| Ingoldsby Academy141390 | Primary | Good | 19.1% | 68 |
| John Spendluffe Foundation Technology College136968 | Secondary | Good | 55.3% | 650 |
| Keelby Primary Academy141793 | Primary | Good | 26.7% | 176 |
| Kelsey Primary School120469 | Primary | Good | 18.0% | 100 |
| Kesteven and Grantham Girls' School138638 | Secondary | Outstanding | 9.1% | 1,238 |
| Kesteven and Sleaford High School Selective Academy137667 | Secondary | Outstanding | 10.2% | 747 |
| Kidgate Academy138637 | Primary | Requires Improvement | 31.7% | 397 |
| King Edward Vi Academy138783 | Secondary | Good | 47.6% | 357 |
| King Edward Vi Grammar School142262 | Secondary | Good | 12.7% | 900 |
| Kirkstone House School120729 | Not applicable | — | — | 118 |
| Kirton Primary School120415 | Primary | Good | 35.3% | 537 |
| Kisimul School120740 | Not applicable | — | — | 58 |
| Lacey Gardens Junior Academy146499 | Primary | Good | 64.2% | 307 |
| Langtoft Primary School120381 | Primary | Good | 12.8% | 188 |
| Leadenham Church of England Academy149272 | Primary | Requires Improvement | 54.2% | 24 |
| Legsby Primary School120457 | Primary | Good | 34.6% | 26 |
| Leslie Manser Primary School120509 | Primary | Good | 43.2% | 264 |
| Lift North Thoresby139868 | Primary | Good | 18.4% | 98 |
| Lift Utterby139885 | Primary | Expected standard | 22.4% | 67 |
| Linchfield Academy147677 | Primary | Good | 23.5% | 294 |
| Lincoln Birchwood Junior School120508 | Primary | Good | 59.7% | 253 |
| Lincoln Bishop University133835 | Not applicable | — | — | — |