| Hiram S. Hall | |
| Birth Date: | 26 September 1835 |
| Birth Place: | Bakersville, New York |
| Placeofburial: | Lawrence, Kansas |
| Allegiance: | United States |
| Branch: | United States Army |
| Rank: | Lieutenant colonel Brevet Brigadier general |
| Unit: | 27th New York Volunteer Infantry Regiment Company G, 121st New York Volunteer Infantry 43rd United States Colored Troops |
| Battles: | American Civil War Battle of Gaines's Mill Second Battle of Rappahannock Station |
| Awards: | Medal of Honor |
Hiram Seymour Hall (September 26, 1835 - July 1, 1908) was a Union Army officer in the American Civil War who received the U.S. military's highest decoration, the Medal of Honor
Hall was born in Barkersville, New York, on September 26, 1835. He was awarded the Medal of Honor, for extraordinary heroism shown on June 27, 1862, at the Battle of Gaines's Mill and on November 7, 1863, at the Second Battle of Rappahannock Station, while serving as a captain with Company G, 121st New York Infantry.
After the war, he returned to New York and married Augusta J. Galentine Hall (1842–1927). The couple had three children: Clarence Seymour Hall (1868–1922), Harry B. Hall (1869–1891), and Augusta J. Hall Kemper (1880–1940). His Medal of Honor was issued on August 17, 1891. Hall died at the age of 72, on July 1, 1908, survived by his wife and two of his children and was buried at Oak Hill Cemetery in Lawrence, Kansas.