Otto Hagen
Otto Hagen is the name of the following people:
- Otto vom Hagen (1562–1626), German mining entrepreneur
- Otto von Hagen (1817–1880), German forest official
- Otto von dem Hagen (1846–1927), German clergyman and painter
- Otto Hagen (lawyer) ( Otto Franz Hermann Hagen ; 1865–1941), German lawyer
