Robert Thoeren was a German screenwriter and film actor. Thoeren was born in Moravia, then part of the Austro-Hungarian Empire. After the First World War the German-speaking Thoeren emigrated to Germany where he became a theatre and film actor. Thoeren appeared in leading roles in several German-language films made by Paramount at the Joinville Studios in Paris.
Thoeren went into exile following the Nazi rise to power in 1933, first in France and later in the United States. Thoeren had already ceased acting and begun writing screenplays for films and became a top writer in the United States working with leading directors including Joseph Losey and William Dieterle. Thoeren returned to Germany after the Second World War and continued his career as a screenwriter. His story idea for the 1935 French film Fanfares of Love and its 1951 German remake Fanfares of Love was used as the basis for Billy Wilder's Some Like It Hot released in 1959, two years after his death.