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 Mac Brádaigh (1690-1760) writer
Fiachra Trench (b.1941) composer
