Robert Reinert (eigentlich Robert Halbgebauer; * 29. April 1872 in Wulzeshofen, Österreich-Ungarn; † 31. August 1928 in Berlin) war ein österreichischer Drehbuchautor, Filmregisseur und Filmproduzent. ()
Robert Reinert was a German film director and screenwriter. Born in Vienna, he moved to Munich around 1900. He wrote several novels, including "Der Weg zur Sonne" and "Krieg". His successful script for the film Homunculus led him to direct several films, most notably Opium and Nerven.