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| Magnentius | 350 | 353 | Roman Empire | ||
| Magnentius or Decentius | 350 | 353 | Roman Empire | ||
| Magnus Maximus | 383 | 388 | Western Roman Empire | ||
| Magnus Maximus or Flavius Victor | 384 | 388 | Roman Empire | ||
| Majorian | 457 | 461 | Western Roman Empire | ||
| Marcian | 450 | 457 | Eastern Roman Empire | ||
| Marwan b. al-Hakam | 684 | 685 | Umayyads | ||
| Marwān b. Muḥammad b. Marwān | 744 | 750 | Umayyads | ||
| Masuna | 508 | 535 | |||
| Maurice | 582 | 602 | Eastern Roman Empire | ||
| Maximus of Barcino | 410 | 411 | Western Roman Empire | ||
| Mehadeyis | 360 | 375 | Aksumites | ||
| Mu'awiya b. Abī Sufyān | 661 | 680 | Umayyads | ||
| Mu'awiya b. Yazid | 683 | 684 | Umayyads | ||
| Nana | 700 | 725 | Bukharkhudat | ||
| Narseh | 293 | 302 | Sasanians | ||
| Nezana | 450 | 500 | Aksumites | ||
| Nezool | 450 | 500 | Aksumites | ||
| Odoacer | 476 | 493 | Western Roman Empire | ||
| Ohrmazd I | 272 | 273 | Sasanians |