Physics: Biographies
- Josef Stefan
- Joseph Henry
- Joseph John Thomson
- Josiah Willard Gibbs
- K. Alex Muller
- Karl Ferdinand Braun
- Karl Manne Georg Siegbahn
- Karl Taylor Compton
- Kenneth Geddes Wilson
- Klaus Von Klitzing
- Laura Bassi
- Leo Szilard
- Leon Max Lederman
- Lev Davidovich Landau
- Lewis Morris Rutherfurd
- Lise Meitner
- Ludwig Boltzmann
- Luis Walter Alvarez
- Macedonio Melloni
- Marchese Guglielmo Marconi