"Thomas Hartmann" or "Thomas Hartman" may refer to:

*Thomas de Hartmann (1885–1956), Russian composer and associate of George Ivanovitch Gurdjieff

*Thomas W. Hartmann, 2nd Legal Adviser to the Convening Authority in the Department of Defense Office of Military Commissions

*Thom Hartmann (born 1951), American broadcaster and author

*Thomas Hartman (scientist), faster-than-light theoretician, discoverer of the Hartman effect

*Monsignor Tom Hartman, co-host of The God Squad (Telecare)

More Thomas Hartmann on Wikipedia.