| Name | CR | MR | Type | Environment |
| Manasaputra, Solar Pitri (Agnishvatta) | 22 | 8 | outsider (extraplanar, good, lawful, manasaputra, mythic) | any (Positive Energy Plane) |
| Manticore | 6 | 2 | magical beast (mythic) | warm hills and marshes |
| Medusa | 9 | 3 | monstrous humanoid (mythic) | temperate marshes and underground |
| Minotaur | 6 | 2 | monstrous humanoid (mythic) | temperate ruins or underground |
| Mummy | 7 | 3 | undead (mythic) | any |
| Myrmecoleon | 10 | 3 | magical beast (mythic) | temperate plains or hills |