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.

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.

[1] He died on March 13, 1914, in Manhattan, Kansas and is buried in Sunset Cemetery.

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