Oskar Schlemmer (Stuttgart, September 4, 1888 - Baden-Baden; April 13, 1943) was a painter, sculptor and German designer related to the Bauhaus School.

Born in Stuttgart, he had a training in marquetry. He entered the Bauhaus of Weimar in 1920. He worked for some time in the wall sculpture workshop and, then, in sculpture. The most famous work of him is Triadisches Ballett (1922), in which the actors appear disguised as geometric forms. Also in Slat Dance and Treppenwitz, the wardrobe of the interpreters makes them live sculptures, as if they were part of the scenario. Also for the scope of dance he made the locker room of Blonde Marie with Trudi Schoop in 1938.

In 1923 he was hired as a teacher of the theater workshop. When the Bauhaus moved to Dessau, he created testing theaters.

The private cards of him, especially those directed to Otto Meyer and Willi Baumeister, and his personal diary have given valuable references of what was happening in the Bauhaus. Especially, he talks about how staff and students reacted to the many changes and developments that occurred at school.