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| Character | Description |
| MacDougal, Morag | Student at Hogwarts mentioned in the sorting. |
| Macmillan, Ernie | Hufflepuff student; friend of Justin Finch-Fletchley, who was petrified when the Chamber of Secrets was opened. |
| Malfoy, Draco | Harry's arch-nemesis. A Slytherin student and seeker. |
| Malfoy, Lucius | Draco's father. |
| Malfoy, Narcissa | Draco's pale-faced mother. |
| Malkin, Madam | Owns robe shop. |
| Mason, Mr. and Mrs. | A rich builder and wife who come to a dinner party at the Dursley's on Harry's twelfth birthday. |
| Maxime, Olympe | Half-giant headmistress of Beauxbatons Academy. |
| McGonagall, Minerva | The strict Transfiguration teacher. Is Head of Gryffindor house and Deputy Headmistress of Hogwarts. |
| McGuffin, Jim | Muggle weatherman. |
| McKinnons | Family killed by Voldemort |
| Merlin | Character on Chocolate Frog card. |
| Mimsy-Porpington, Sir Nicholas de |
Nearly Headless Nick's real name. |
| Moaning Myrtle | Unhappy girl ghost that haunts the upstairs girls' bathroom. |
| Moody, Alastor | Former Defense Against the Dark Arts teacher. Highly successful auror, was stunned and kept in a box throughout the entire schoolyear at Hogwarts while he was being impersonated by the late Bartemius Crouch Jr. |
| Moon | Hogwarts student mentioned in sorting. |
| Moony | Remus Lupin's childhood nickname. |
| Morgana | Character on Chocolate Frog card. |
| Mrs. Norris | Filch's cat that stalks the castle looking for any rule-breaking |
| Nearly Headless Nick | The Gryffindor house resident ghost. His head is held on by a miniscule piece of flesh. |
| Norbert | Norwegian Ridgeback, Hagrid's pet dragon. |
| Nott | Student at Hogwarts mentioned in the sorting. |
