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| Fiach mac Aodha Ó Broin Fiach MacHugh O'Byrne | |
|---|---|
| Lord of "Clann Uí Bhroin" | |
 The armorial achievements of Fiach McHugh O'Byrne | |
| Reign | 1579–1597 |
| Coronation | 1587, County Wicklow |
| Predecessor | Aodh mac Seáin Ó Broin |
| Successor | Féilim mac Fiach Ó Broin |
| Born | c.1534 Ballinacor |
| Died | 8 May 1597 Farranerin, County Wicklow |
| Spouse | Rose Ó Tuathail (second wife) |
| House | Ballinacor – Ranelagh |
Fiach mac Aodha Ó Broin (anglicised as Feagh or Fiach MacHugh O'Byrne) (1534 – 8 May 1597) was Chief of the Name of Clann Uí Bhroin (Clan O'Byrne) and Lord of Ranelagh during the Elizabethan wars against the Irish clans.