| Maltese Road Primary School141511 | Primary | Good | 10.0% | 211 |
| Manningtree High School137945 | Secondary | Good | 12.4% | 917 |
| Manuden Primary School114979 | Primary | Good | 1.8% | 109 |
| Maple Grove Primary School144349 | Primary | Good | 39.3% | 303 |
| Margaretting Church of England Voluntary Controlled Primary School146242 | Primary | Good | 27.5% | 69 |
| Mark Hall Academy148423 | Secondary | Requires Improvement | 27.4% | 843 |
| Market Field School143589 | Not applicable | Good | 42.6% | 502 |
| Matching Green Church of England Voluntary Controlled Primary School115126 | Primary | Good | 13.3% | 90 |
| Mayflower High School137048 | Secondary | Requires Improvement | 9.7% | 1,620 |
| Maylandsea Primary School142254 | Primary | Good | 13.9% | 230 |
| Meadgate Primary School140375 | Primary | Good | 20.9% | 215 |
| Merrylands Primary School143205 | Primary | Good | 21.2% | 546 |
| Mersea Island School115311 | Primary | Good | 19.6% | 393 |
| Messing Primary School139252 | Primary | Good | 19.3% | 88 |
| Mid Essex Co-Operative Academy143591 | Not applicable | Good | 54.2% | 72 |
| Mildmay Primary School146980 | Primary | Good | 12.6% | 620 |
| Milldene Primary School114760 | Primary | Good | 21.9% | 196 |
| Millfields Primary School115261 | Primary | Good | 6.0% | 215 |
| Millhouse Primary School114912 | Primary | Good | 34.2% | 617 |
| Milwards Primary School and Nursery144631 | Primary | Good | 30.3% | 226 |
| Minerva Independent School149506 | Not applicable | — | — | 1 |
| Monkwick Infant and Nursery School140735 | Primary | Good | 29.3% | 170 |
| Monkwick Junior School145020 | Primary | Good | 40.2% | 241 |
| Montgomerie Primary School141182 | Primary | Good | 17.0% | 206 |
| Montgomery Primary School, Colchester114750 | Primary | Good | 18.5% | 340 |
| Moreton Church of England Voluntary Aided Primary School115188 | Primary | Good | 8.5% | 188 |
| Moulsham High School136863 | Secondary | Good | 13.0% | 1,670 |
| Moulsham Infant School136855 | Primary | Good | 14.3% | 293 |
| Moulsham Junior School137971 | Primary | Good | 14.2% | 685 |
| Mountnessing Church of England Primary School145773 | Primary | Good | 8.2% | 182 |
| Myland Community Primary School114708 | Primary | Good | 13.7% | 307 |
| Nazeing Primary School151971 | Primary | Good | — | — |
| New Hall School115387 | Not applicable | — | — | 1,335 |
| Newhall Primary Academy145880 | Primary | Good | 11.1% | 501 |
| Newlands Spring Primary and Nursery School138533 | Primary | Good | 12.0% | 488 |
| Newport Primary School114985 | Primary | Good | 17.2% | 163 |
| Noak Bridge Primary School144086 | Primary | Good | 18.0% | 211 |
| North Crescent Primary School145049 | Primary | Good | 33.1% | 194 |
| North East Essex Co-operative Academy143590 | Not applicable | Good | 62.1% | 87 |
| North Primary School and Nursery114709 | Primary | Good | 21.0% | 455 |
| Northlands Primary School and Nursery143125 | Primary | Good | 35.7% | 753 |
| Northwick Park Primary and Nursery Academy141571 | Primary | Good | 35.6% | 665 |
| Notley Green Primary School138901 | Primary | Good | 11.7% | 410 |
| Notley High School and Braintree Sixth Form137013 | Secondary | Requires Improvement | 17.8% | 1,255 |
| Oak View School145987 | Not applicable | Good | 44.1% | 138 |
| Oakfield Primary School131806 | Primary | Good | 10.1% | 395 |
| Oaklands Infant School146210 | Primary | Good | 4.0% | 173 |
| Oaklands School115419 | Not applicable | — | — | 256 |
| Oakwood Infant and Nursery School114722 | Primary | Good | 49.8% | 326 |
| Octavia House Schools, Essex148934 | Not applicable | — | — | 39 |