Tadhg Riabhach Ó Dubhda (died 1432) was King of Uí Fiachrach Muaidhe.
Tadhg Riabhach is the last Ó Dubhda expressly listed as King of Uí Fiachrach Muaidhe in any contemporary or near-contemporary document.
Araile do fhlathaibh Ua nDubhda says of him:
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