Philosophy: Biographies
- Jean Buridan
- Jean Jacques Rousseau
- Jeremy Bentham
- Johann Friedrich Herbart
- Johann Gottlieb Fichte
- John Anderson
- John Bordley Rawls
- John Dewey
- John Duns Scotus
- John Langshaw Austin
- John Locke
- John Millar
- John Norris
- John of Salisbury
- John Scotus Erigena
- John Stuart Mill
- Jose Ortega Y Gasset
- Joseph Glanvill
- Josiah Royce
- Juan Luis Vives