Long Tom may refer to:
Long Tom River, in Oregon, United States Long Tom Pass, a mountain pass in Mpumalanga, South Africa Long Tom Commando, a light infantry regiment of the South African Army Long Tom (fish), common name for the Belonidae or Needlefish Long Tom (rocket), an Australian sounding rocket Long Tom (cannon), a generic name for some early cannon and field guns, more specifically: 155 mm Long Tom, a US World War II era field gun 155 mm Creusot Long Tom, a Boer War field gun Major Thomas J. "Long Tom" Roberts, fictional character in the Doc Savage stories "Long Tom" Watson, protagonist in the Long Tom's treasure legend Long Tom Hughes (1878–1956), American baseball player