Myson (Japanese: ミソン Myson) is a minor antagonist appearing in Fire Emblem: Three Houses. He is a high ranking member of "those who slither in the dark".

Myson makes his first canonical appearance in Part I during Constance and Yuri's paralogue, ambushing Duke Gerth in Empire territory with the intention of stealing the Fetters of dromi with the support of some hired thugs of his choice, who he experimented with in order to turn them into Demonic Beasts during battle. Myson is eventually defeated and forced to escape, though not without claiming his experiments were successful in the end.

On the Silver Snow and Verdant Wind routes, Myson is one of the many Agarthans defending Shambhala from the Resistance Army/Leicester Alliance. He can be circumvented or slain at the player's discretion, although the ensuing destruction of the underground city at the hands of Thales makes his chances of survival fairly slim. On the Azure Moon route, Myson aids Edelgard's army and fights alongside his own troops against the Kingdom army during the final battle at the Imperial Palace, where his defeat makes every soldier at his command flee from the battle. By contrast, Myson makes no appearances on the Crimson Flower route.

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