Olga Kosakiewicz

In 1946 in Simone de Beauvoir's unique Drama Les Bouches inutiles she played Clarice the daughter of Catherine and Louis d'Avesnes the main characters.

In 1946 Olga married Jacques-Laurent Bost, a long-time lover of de Beauvoir. She died of tuberculosis in 1983.

A motivation of Sartre to write the play The Flies was to give Kosakiewicz an opportunity for a debut as a theater actress. The Flies should have premiered at the Comédie-Française, but the intendant Jean-Louis Barrault did not agree to Sartre's condition that Olga Kosakiewicz should assume the role of Electra. So it was premiered on June 3, 1943 at the Théâtre de la Cité internationale [fr] (aka Théâtre Sarah Bernhardt).

Olga Kosakiewicz visited the Lycée Joan of Arc in Rouen, where she was taught by Colette Audry and in 1932 presented to Simone de Beauvoir, in 1934 when Jean-Paul Sartre returned from a study visit from the German Reich she was also presented to him. At the end of the school year 1934 she passed her Baccalauréat as best. From autumn 1934 to 1936 she studied medicine at the University of Rouen, then lived in Paris. From 1934 to 1935 Beauvoir and from 1935 to 1937 Sartre had an affair with her. Her irrepressible, rebellious character, characterized by emotional high and low, her authenticity and spontaneity charmed Sartre and Beauvoir.

Olga Kosakiewicz (Ukrainian: Ольга Козакевич; 6 November 1915 – 1983) was a French theater actress.