Nath Í, an early Irish personal name for males, may refer to:
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Nath Í mac Fiachrach
Nath Í, also known as Dathí, son of Fiachrae, son of Eochaid Mugmedon, was a semi-historical Irish king of the 5th century, the father of the likely-historical king Ailill Molt and the ancestor of the Uí Fiachrach dynasties of early medieval ...
, 5th-century legendary king of Connacht
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Nath Í of Cúl Fothirbe
Saint Nath Í or Nathí (''fl''. 6th century?), also anglicised to Nathy, was an early Irish saint of the Dál Messin Corb, who was credited with the foundation of Cúl Fothirbe in Dál nAraide territory and with becoming its first bishop.Mac S ...
, saint of the Dál Messin Corb of Leinster (''fl''. 6th century)
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Nath Í of Achonry
Nath Í, or Crumnathy, (''fl''. 6th century) was an early Irish saint who is remembered as the founder of Achonry.
He is said to have been born in the barony of Leyney, in present-day County Sligo. In the 17th century, John Colgan compiled a ...
, saint in present-day Co. Sligo, Connacht (''fl''. 6th century)
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