Fiacre is both a given name and a surname. Notable people with the surname include:
Given name Fiacre Kelleher (born 1996), Irish professional footballer Fiacre Ntwali (born 1999), Rwandan footballer
Middle name Etienne Fiacre Louis Raoul (1815–1852), French naval surgeon and naturalist Jean Fiacre Kouamé Botué (born 2002), Ivorian professional footballer
Surname Jean Guilleaume Fiacre (1730–1805), German writer, collector and charlatan
See also Fiacre (disambiguation)