Francis de Croisset (French: [fʁɑ̃sis də kʁwasɛ]; born Franz Wiener, January 28, 1877 – November 8, 1937) was a Belgium-born French playwright and opera librettist.His opera librettos include Massenet's Chérubin (1905), based on his play of the same name, and Reynaldo Hahn's Ciboulette (1923).He married, in 1910, Marie-Thérèse Bischoffsheim, the widow of banking heir Maurice Bischoffsheim and the daughter of Count and Countess Adhéaume de Chevigné.