 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.Sternheim's circle of prominent friends included Gottfried Benn, Carl Einstein, Franz Pfemfert, Walther Rathenau, Ernst Stadler, Hugo von Tschudi, Fritz von Unruh, and Otto Vrieslander.