- Søren Kierkegaard (1813-1855)
- Birthplace: Copenhagen
- Either-Or (1843)
- Philosophical Fragments (1844)
- Concluding Unscientific Postscript (1846)
- Ferdinand Canning Scott Schiller (1864-1937)
- Birthplace: Schleswig-Holstein, Denmark
- Riddles of the Sphinx (1891)
- Axioms as Postulates (1902)
- Humanism: Philosophical Essays (1903)
- Studies in Humanism (1907)
- Plato or Protagoras? (1908)
- Formal Logic (1912)
- Problems of Belief (1924)
- Tantalus, or The Future of Man (1924)
- Eugenics and Politics (1926)
- Logic for Use (1929)
- Birthplace: Copenhagen