William Hartmann
William Hartman or William Hartmann may refer to:
Hartman
- William [Coleman Hartman Jr.], American football player
- William G. Hartman, West Virginia politician
- William J. Hartman, U.S. Army general and acting director of the National Security Agency
- Billy Hartman, Scottish actor
- Meteos , American professional League of Legends player
Hartmann
- William Kenneth Hartmann, planetary scientist and author at the Planetary Science Institute
- William M. Hartmann, physicist, psychoacoustician at Michigan State University