- Humboldt, Baron Wilhelm von Humboldt, Baron Karl Wilhelm von Humboldt - German philologist noted for his studies of the relation between language and culture (1767-1835)
--1 is a kind of philologist, philologue
- Humboldt, Baron Alexander von Humboldt, Baron Friedrich Heinrich Alexander von Humboldt - German naturalist who explored Central and South America and provided a comprehensive description of the physical universe (1769-1859)
--2 is a kind of naturalist, natural scientist