Jef Le Penven (3 November 1919 - 30 April 1967) was a French composer, born in Pontivy, Morbihan, Brittany. Le Penven was the twelfth child of a family of cabinet makers. He was brought up in an atmosphere of traditional vernacular music, learning to play the bombard (Breton oboe) as a child. He studied at the Schola Cantorum in Paris, working with Marcel Dupré. In 1940, he became the conductor or the Orchestre de Bretagne. Le Penven was also well known for his organ improvisations, of which he was a virtuoso.