Johann Hagen
Johann Hagen is the name of the following people:
- Johann Hagen (abbot) , clergyman, abbot of Mondsee (until 1536)
- Johann von Hagen (1724–1782), German lawyer
- Johann Hagen (lawyer) (* 1943), Austrian lawyer, legal sociologist and university professor
- Johann Georg Hagen (1847–1930), Austrian Jesuit and astronomer
- Johann Hugo II. Von Hagen (1707–1791), Austrian statesman and diplomat
- Johann Philipp Hagen (1734–1792), German surgeon, obstetrician and university professor
See also: