Casoni is a surname. Notable people with the surname include:
Bernard Casoni (born 1961), French football manager and player Filippo Casoni (1733–1811), Italian Roman Catholic cardinal Filippo Casoni (bishop) (1599–1659), Italian Roman Catholic bishop Giulia Casoni (born 1978), Italian tennis player Lorenzo Casoni (1645–1720), Italian Roman Catholic cardinal Tomaso Casoni (1880–1933), Italian physician
See also Casoni test