| 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 | |
| Morpheus | | MAWR-fee-əs (English) | Greek Mythology | |
| Morrigan | | - | Irish Mythology | |
| Mot | | - | Near Eastern Mythology | |
| Muirenn | | - | Irish, Irish Mythology | |
| Muirgen | | - | Irish, Irish Mythology | |
| Muirne | | - | Irish Mythology | |