Johann Caspar Bluntschli was a Swiss jurist and politician. Together with fellow liberals Francis Lieber and Édouard René de Laboulaye, he developed one of the first codes of international law and war.

Johann Kaspar Friedrich Manso was a German historian and philologist.

Johann Kaspar Lavater was a Swiss poet, writer, philosopher, physiognomist and theologian.

Johann Kaspar Mörikofer was a Swiss literary and ecclesiastical historian.

Johann Kaspar Zeuss was a German historian and founder of Celtic philology. He is credited with demonstrating that the Celtic languages belong to the Indo-European group.

Johann Klaj (Latinized Clajus) (1616 – 16 February 1656) was a German poet.

Johann Lorenz von Mosheim or Johann Lorenz Mosheim was a German Lutheran church historian.

Johann Ludwig Klüber was a German law professor, author and state official.

Johann Martin Lappenberg was a German diplomat and historian.

Johann Martin Miller was a German theologian and writer. He is best known for his novel Siegwart, which became one of the most successful books at the time.