- Franck, Cesar Franck - French composer and teacher who influenced a generation of composers (1822-1890)
--1 is a kind of composer
- Franck, James Franck - United States physicist (born in Germany) who with Gustav Hertz performed an electron scattering experiment that proved the existence of the stationary energy states postulated by Niels Bohr (1882-1964)
--2 is a kind of physicist