The Fianna are a band of heroes in Irish mythology.

Fianna can also refer to:

• Fianna Fáil, a political party in Ireland
• Fianna Éireann, the name of several Irish republican youth movements
• CLG Na Fianna, a Dublin-based Gaelic Athletic Association club
• Fianna, a tribe of werewolves in the White Wolf Game Studio roleplaying game Werewolf: The Apocalypse.

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