Johann Hoyer
Johann Hoyer is the name of the following people:
- Johann Adam Hoyer senior (1776–1820), Austrian musical instrument maker
- Johann Adam Hoyer (watchmaker) († 1838), Austrian watchmaker
- Johann Adam Hoyer junior (1817 – after 1860), Austrian musical instrument maker
- Johann Georg Hoyer (1663–1737), German physician
- Johann Gottfried von Hoyer (1767–1848), German major general and military writer