Lioncourt or de Lioncourt is a surname. Notable people with this name include:
People Guy de Lioncourt (1885–1961), French composer Vincent Berthier de Lioncourt (born 1947), French musician
Fictional characters Lestat de Lioncourt, character from Anne Rice's The Vampire Chronicles novel series Gabrielle de Lioncourt, character from the same series, Lestat's mother, see List of The Vampire Chronicles characters