French playwright whose works, linked with the avant-garde theatre, examined human relationships and found them doomed to failure.

As a youth, Billetdoux studied at the Charles Dullin School of Dramatic Art and the Institute of Higher Cinematographic Studies. From 1949 to 1950, he was director of the French Radio Department in Martinique.

Tchin-Tchin (1959; Chin-Chin), his first play to win popular acclaim, traces the decline into alcoholism of a couple brought together by the infidelity of their spouses. In Le Comportement des époux Bredburry (1960; “The Behaviour of the Bredburry Couple”), a wife attempts to sell her husband in the classified pages of a newspaper. Va donc chez Törpe (1961; “Go to the Torpe Establishment”; Eng. trans. Chez Torpe) tallies the suicides in an inn whose owner insists on breaking down her guests' defenses. Other plays include Il faut passer par les nuages (1964; “You Must Pass Through the Clouds”) and Comment va le monde, môssieu? Il tourne, môssieu! (1964; “How is the World, Mister? It's Turning, Mister!”). For several years Billetdoux worked in films and television, but he did write a fantasy play for the stage, Reveille-toi, Philadelphia (1988; “Wake Up, Philadelphia”). Structured around rapid, unexpected variations in mood and emotions, Billetdoux's plays are complex works, emphasizing social and philosophical arguments.