Friedrich Hopfner (28 October 1881 — 5 September 1949) was an Austrian geodesist, geophysicist and planetary scientist.As an officer of the Austro-Hungarian Empire he began his scientific work at the Bureau of Meteorology. In 1921 he became Chief Astronomer at the new Geodetic Survey of Austria (Federal Office for Metrology and Survey or Bundesamt für Eich- und Vermessungswesen).