Oskar Gustav Rudolf Hergt was a German lawyer and nationalist politician, who served simultaneously as the minister of Justice and vice-chancellor from 28 January 1927 to 12 June 1928. Hergt attended the prestigious Domgymnasium Naumburg before studying law at Würzburg, Munich and Berlin. He worked as a Gerichtsassessor in Saxony, and as a judge in Liebenwerda. Hergt held various senior offices at the Prussian Ministry of Finance from 1904 to 1914.