Fiachra is an Irish male given name. It may refer to:
Clerics
Saint Fiacre of Breuil (died 670), missionary in France Fiachra mac Colmain (500–558) Bishop of Armagh Fiachra Ua Focarta (died 1006) abbot of Clonfert Fiachra Ó Ceallaigh (born 1933) bishop of Dublin
Legendary kings
Fiachrae son of Eochaid Mugmedon and namesake of Tireragh, County Sligo Fiachra Suighe legendary pre-Christian founder of the Dal Fiachrach Suighe Fiacha mac Delbaíth, legendary High King
Medieval kings
Fiachra Cossalach (died 710) king in Ulster Fiachra Finn (fl 5th century) king of Uí Maine in Connacht
Sportsmen
Fiachra McArdle (b.1983) association footballer Fiachra Breathnach (b.1986) Gaelic footballer from Galway Fiachra Lynch (b.1987) Gaelic footballer from Cork
Other
Fiachra, mythological son of Ler from the Children of Lir legend Fiachra Mac Brádaigh (1690–1760) writer Fiachra Trench (b.1941) composer
See also Fiach Fiacha Fiachna List of Irish-language given names