| Name | Type | Class | Level | Zone |
| Mac Kenzie | Quest NPC | Covent Garden Station | ||
| Madam Katharine | ||||
| Mag | Quest NPC | Temple Station | ||
| Maggot Spawner | Monster | Necro | ||
| Mangy Stalker | Demon | 2 - 5 | Covent Garden Train Depot, Holborn Access Shafts | |
| Master Orb | Quest Monster | 25 - 30 | Necropolis Level 3 | |
| Masterblaster | Quest Monster | 12 | Death's Sewers | |
| Maxim | Quest NPC | Templar Base | ||
| Mig | Charing Cross Station | |||
| Moloch | Quest Monster | Torment | ||
| Morbat | Quest Monster | 24 | King William Street | |
| Morphoid | Monster | |||
| Motley Beast | Quest Monster | Tudor Street | ||
| Murmur | Quest NPC | Russell Square | ||
| Murmur (CCS) | Quest NPC | Charing Cross Station | ||
| Murmur (Covent Garden Station) | Quest | Covent Garden Station | ||
| Murmur (Holborn Station) | Quest NPC | Holborn Station | ||
| Murmur (OCS) | Quest NPC | Oxford Circus Station | ||
| Murmur (TS) | Quest NPC | Temple Station | ||
| Mutilator | Quest Monster | 25 | King William Street | |
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