Henry Thomas Harrison (April 23, 1832 – October 28, 1923) was a spy for Confederate Lieutenant General James Longstreet during the American Civil War.

In April 1863, Harrison met Lieutenant General James Longstreet of the Confederate Army of Northern Virginia during the Battle of Suffolk.

Also, to maintain the loyalty of his prized spy, Longstreet frequently paid Harrison in U.S. gold coins and/or greenbacks, which were significantly more valuable than Confederate currency.

After the war, Harrison took his wife and two daughters to Mexico, hoping that the youngest would find better health in the warmer climate due to her asthma.

[4] Harrison was a major character in Michael Shaara's 1974 historical novel The Killer Angels, and was played by Cooper Huckabee in the film version Gettysburg.

Huckabee also portrays Harrison in the director's cut of Gods and Generals, with scenes depicting him in off-stage conversation with John Wilkes Booth.