French novelist, journalist, and critic, a practitioner of the avant-garde school of nouveau roman (“new novel”) writers, who, in the 1950s and '60s, spurned the traditional novel.

A son of the novelist François Mauriac, he was able to make the acquaintance of many notable French writers at his father's house and later during his career as a journalist. He worked as Charles de Gaulle's private secretary from 1944 to 1949 and was a columnist and film critic for the newspapers Le Figaro and Le Figaro Littéraire from 1946 to 1977.

Mauriac established his own reputation as a novelist with four works published under the general title Le Dialogue intérieur: Toutes les femmes sont fatales (1957; All Women Are Fatal), Le Dîner en ville (1959, Prix Médicis; The Dinner Party), La Marquise sortit à cinq heures (1961; The Marquise Went Out at Five), and L'Agrandissement (1963; “The Enlargement”). These books deal with the adventures of Bertrand Carnéjoux, the hero and narrator, who is both an irresistible womanizer and a cold-hearted egoist. These highly experimental novels focus on characters' states of mind and their varying experiences of time within a general atmosphere of sexual intrigue.

Mauriac's best-known work, the 10-volume Le Temps immobile (1974–88; “Time Immobilized”), consists of excerpts from letters, documents, and parts of other writers' works interspersed with entries from his own diaries. These books paint a rich picture of 50 years of French intellectual life, with separate volumes devoted to his father, de Gaulle, and Marcel Proust. Mauriac is also known for L'Alittérature contemporaine (1958; The New Literature), a collection of essays on 20th-century writers.