Thomas Hartmann or Hartman may refer to: Thomas de Hartmann (1885–1956), Russian composer and associate of George Ivanovitch Gurdjieff Thomas Hartmann (biologist) (1937–2017), German pharmaceutical biologist and ecologist 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 Tom Hartman, a character on the American soap opera parody Mary Hartman, Mary Hartman Thomas Hartmann (footballer) (born 1967), Swiss football striker