Portrait of Louis Guillaume is an oil on canvas portrait by Paul Cézanne painted c. 1882. Guillaume was the son of friends of the artist and a friend of Cézanne's son, Paul. Here he is portrayed in a highly sculpted manner with a near-expressionless, uncommunicative face, and an immobile, lifeless body. In form and complexity, the painting is ahead of its time. It contains many abstractions, mostly in its presentation of the head and body as simple, solid shapes, a technique later taken up and developed by Henri Matisse.