Morvan Lebesque (January 11, 1911 in Nantes, France – 4 July 1970 in Brazil), was the Breton language name of Maurice Lebesque, a Breton nationalist activist and French journalist.
Lebesque was born in Nantes, at the Quai Barbin (now dock Barbusse), and had his secondary education at Clemenceau High School.
During the German occupation of France in World War II, he worked for the collaborationist newspaper L'Heure Bretonne, then for various journals in Paris, where he met and befriended Jean-Paul Sartre and Simone de Beauvoir.
In 1952, Lebesque joined the satirical journal Le Canard Enchaîné, for which he wrote a popular column, modelling his style on Albert Camus, with whom he became a close friend, and of whom he would later publish a biography.
After 1966, Lebesque also participated in the Breton autonomist revue Ar Vro.