| Mictlantecuhtli | | - | Aztec And Toltec Mythology | |
| Midas | | MIE-dəs (English) | Greek Mythology | |
| Mielikki | | - | Finnish Mythology | |
| Milda | | - | Lithuanian, Baltic Mythology | |
| Minerva | | mi-NUR-və (English) | Roman Mythology, English | |
| Minos | | - | Greek Mythology | |
| Mithra | | MITH-rə (English) | Persian Mythology | |
| Mithras | | MITH-rəs (English) | Persian Mythology (Hellenized) | |
| Mneme | | - | Greek Mythology | |
| Mnemosyne | | ni-MAWS-ə-nee (English) | Greek Mythology | |
| Modred | | - | Welsh Mythology, Arthurian Romance | |
| Mokosh | | - | Slavic Mythology | |
| Morana | | - | Slavic Mythology, Croatian | |
| Mordad | | - | Persian Mythology | |
| Mordred | | - | Welsh Mythology, Arthurian Romance | |