Born on 14 May 1925 in Bayonne, Marie Laure Viole Bellon was the daughter of Jacques Bellon, a magistrate, and Denise Simone Hulmann, a well-known photographer. In 1947, she married the Spanish writer Jorge Semprún Maura (1923–2011), with whom she gave birth to Jaime Semprún (1947–2010), also a writer. Following a divorce in 1960, she married the poet Claude Roy (1915–1997) in 1962. Loleh Bellon was the younger sister of the film director and screenwriter Yannick Bellon.
