Diarmuid​ is a character from Fire Emblem: Genealogy of the Holy War and Fire Emblem: Thracia 776. He is the son of Lachesis and the older brother of Nanna, and is possibly the half-brother of Fergus.

In Genealogy of the Holy War, Diarmuid is a member of Seliph's army and trains alongside Oifey. In Thracia 776, he joins Leif's army to protect his sister. He is able to wield the Beo Sword in this game, hinting that his canon father is Beowolf.

His substitute character is Tristan in Genealogy of the Holy War.

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