Gaston Arman de Caillavet[1] (13 March 1869[2] – 13 January 1915) was a French playwright.

He was the son of Albert Arman de Caillavet and Léontine Lippmann.

His maternal grandfather, Auguste Lippmann, was a banker of Jewish descent.

He was a close friend of Marcel Proust who found in him and his fiancée, Jeanne Pouquet, a model of the relationship between Robert de Saint-Loup and Gilberte in his famous novel In Search of Lost Time.

Gaston and Jeanne had only one daughter, Simone, who married (second wedding) André Maurois, future biographer of Proust.