Fiach is an Irish male given name. It may refer to: Saint Fiacc, fifth-century bishop of Sletty in Ireland Fiach McHugh O'Byrne (1534–1597) Irish chief Fiach Mac Conghail (born 1964) Irish theatre director and Senator Fiach Moriarty, Irish singer-songwriter
See also Tomás Ó Fiaich, Irish Catholic primate and cardinal
Similar names Fiacha Fiachra Fiachna