Demelius
Demelius is the family name of the following people:
- August Christian Demelius († 1773), mining official from the Electoral Saxony, physician and local politician
- Christian Demelius (1643–1711), German composer
- Gustav Demelius (1831–1891), German-Austrian lawyer and university professor
- Heinrich Demelius (1893–1987), Austrian legal historian and professor at the University of Vienna