Maurice Ronet was born Maurice Julien Marie Robinet in Nice, Alpes Maritimes. He was the only child of professional stage actors Émile Robinet and Gilberte Dubreuil. He made his stage debut at the age of fourteen, alongside his parents in Sacha Guitry's Deux couverts, in Lausanne. After attending the Parisian acting school Centre du Spectacle de la Rue-Blanche, he entered the Paris Conservatoire in 1944, where Jean-Louis Barrault was one of his mentors. When he made his film debut at twenty-two in Jacques Becker's Rendez-vous de juillet (1949), in a role that was written specifically for him by Becker, he had little interest in pursuing an acting career. After completing the film, he married Maria Pacôme (a French stage Actress and playwright) and they departed to Moustiers-Sainte-Marie in Provence, where he tried his hand at ceramics. After completing his military Service, he returned to Paris in the early 1950s where he took courses in philosophy and physics, and pursued his passion for literature, music (piano and organ), film and painting. His artwork, part of the peinture non figurative movement, was exhibited along with friends Jean Dubuffet and Georges Mathieu. He also acted occasionally in small roles in the films of French Directors like Yves Ciampi and René Wheeler, with ambitions of becoming a filmmaker himself. Gradually, however, he came to discover a freedom in acting and a creative satisfaction that provided a synthesis of all his interests.