Encyclopedias, Almanacs, Transcripts, and Maps
- Julius Caesar Scaliger
- Julius Casserius (Giulio Casserio)
- Julius Elster
- Julius Firmius Maternus
- Julius Plücker
- Julius Robert Mayer
- Julius von Payer
- Julius Wagner-Jauregg
- Julius Wilhelm Richard Dedekind
- Jung-Stilling, Johann Heinrich (1740-1817)
- Junìpero Serra
- Jürgenson, Friedrich (1903-1987)
- Just Wages and Salaries
- Juste, Michael
- Justus von Liebig
- Justus von Liebig
- Jyotir Maya Nanda, Swami (1931-)
- K-T Event
- K-T Event (Cretaceous-Tertiary Event)
- K-T Event (Cretaceous-Tertiary Event)