Thomas Horan (c. 1839 – January 1, 1902) was an Irish-American soldier who fought with the Union Army in the American Civil War.

Horan received his country's highest award for bravery during combat, the Medal of Honor, for actions taken on July 2, 1863, during the Battle of Gettysburg.

When Horan was around 8–10 years old, the family moved to America, likely to escape the Great Famine.

They settled in Dunkirk, New York where Thomas worked as a laborer alongside his father.

[5] The President of the United States of America, in the name of Congress, takes pleasure in presenting the Medal of Honor to Sergeant Thomas Horan, United States Army, for extraordinary heroism on 2 July 1863, while serving with Company E, 72d New York Infantry, in action at Gettysburg, Pennsylvania.