Henry Thomas Harrison | |
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| Born | April 23, 1832 Nashville, Tennessee, United States |
| Died | October 28, 1923 (aged 91) Covington, Kentucky, United States |
| Occupation(s) | Spy, detective, prospector |
| Known for | Spying for the Confederate States of America |
| Spouse | Laura Broders |
| Military career | |
| Allegiance | Confederate States |
| Service/ | Confederate States Army |
| Unit | 12th Mississippi Infantry |
| Battles/wars | American Civil War |
Henry Thomas Harrison (April 23, 1832 – October 28, 1923), often known simply as "Harrison", was a spy for Confederate Lieutenant General James Longstreet during the American Civil War. He is best known for the information he gave Longstreet and General Robert E. Lee in the Gettysburg Campaign, which resulted in Lee converging on Gettysburg, Pennsylvania, thus causing the Battle of Gettysburg in July 1863.