Johann Ludwig I.
Johann Ludwig I. is the name of the following ruler:
- Johann Ludwig I (Anhalt-Zerbst) (1656–1704), Prince of Anhalt-Zerbst
- Johann Ludwig I (Nassau-Saarbrücken) (1472–1545), Count of Saarbrücken
- Johann Ludwig I (Nassau-Wiesbaden-Idstein) (1567–1596), ruling Count of Nassau-Wiesbaden-Idstein