Balthus, pseudonym of Balthazar Klossowski, also spelled Balthasar Klossowsky (born February 29, 1908, Paris, France - died February 18, 2001, La Rossinière, Switzerland), reclusive French painter who, in the midst of 20th-century avant-gardism, explored the traditional categories of European painting: the landscape, the still life, the subject painting, and the portrait.
He is best known for his controversial depictions of adolescent girls.