| John H. Callahan | |
| Birth Date: | 25 January 1845 |
| Birth Place: | Shelby County, Kentucky, US |
| Death Place: | Manhattan, Kansas, US |
| Placeofburial: | Sunset Cemetery, Manhattan, Kansas |
| Placeofburial Label: | Place of burial |
| Allegiance: | United States of America Union |
| Branch: | United States Army Union Army |
| Serviceyears: | 1862 - 1865 |
| Rank: | Private |
| Unit: | 122nd Illinois Volunteer Infantry Regiment |
| Battles: | American Civil War |
| Awards: | Medal of Honor |
John H. Callahan (January 25, 1845 - March 13, 1914) was one of two men from the 122nd Illinois Volunteer Infantry Regiment to receive the Medal of Honor during the American Civil War. Callahan was a private in Company B. The medal was awarded for capturing a Confederate flag during the Battle of Fort Blakeley on April 9, 1865; he was one of fourteen men awarded with the Medal of Honor at this battle.
Callahan joined the Army in August 1862, and was mustered out in July 1865.[1]
He died on March 13, 1914, in Manhattan, Kansas and is buried in Sunset Cemetery.
Rank and organization. Private, Company B, 122nd Illinois Infantry. Place and date: At Fort Blakeley, Ala., 9 April 1865. Entered service at : Macoupin County, Ill. Birth: Shelby County, Ky. Date of issue: 8 June 1865.
Citation:
Capture of flag.