Carl Sternheim (born William Adolph Carl Francke; 1 April 1878 – 3 November 1942) was a German playwright and short story writer. One of the major exponents of German Expressionism, he especially satirized the moral sensibilities of the emerging German middle class during the Wilhelmine period.
Sternheim was born in Leipzig, the son of Rosa Marie Flora (née Francke) {1856-1908} and Carl Julius Sternheim {1852-1918}, a banker. His parents married two years after he was born. His father was Jewish and his mother was a Lutheran from a working-class family. Sternheim grew up in Hannover and Berlin. Between 1897 and 1902, he studied philosophy, psychology, and jurisprudence intermittently at the Universities of Munich, Göttingen, and Leipzig, but never graduated. In 1900, he began working as a freelance writer in Weimar, where he met and married his first wife Eugenie Hauth the same year. Their union ended in 1906 and he married the writer Thea Löwenstein (née Bauer) in 1907, with whom he had two children.
The wealth brought by Thea from her rich manufacturing family enabled the couple to build the Schloss Bellemaison in Munich. Here, Sternheim worked in the company of fellow artists such as Mechtilde Lichnowsky, Max Reinhardt, and Frank Wedekind, and assembled his own art collection. In 1908, he collaborated with Franz Blei to launch the Expressionist literary journal Hyperion, which published the first eight prose works by Franz Kafka. He also contributed occasionally to the Expressionist journal Die Aktion. In 1912, he relocated with his family to Belgium and in 1918, they fled the fighting of World War I and temporarily moved to St. Moritz and Uttwil in Switzerland. Sternheim and Thea divorced in 1927. His next marriage, to actress and singer Pamela Wedekind, took place in 1930 and lasted until 1934, after which he lived with Henriette Carbonara. Sternheim died in Ixelles (Brussels) during World War II and was buried in the Ixelles Cemetery. A friend of his, Marcel Hastir (1906–2011), was buried in the same tomb.