Peter Ulrich Weiss was a German writer, painter, graphic artist, and experimental filmmaker of adopted Swedish nationality. He is particularly known for his plays Marat/Sade and The Investigation and his novel The Aesthetics of Resistance.

The Persecution and Assassination of Jean-Paul Marat as Performed by the Inmates of the Asylum of Charenton Under the Direction of the Marquis de Sade, usually shortened to Marat/Sade, is a 1963 play by Peter Weiss. The work was first published in German.