Luther Crawford Ladd (22 December 1843 – 19 April 1861) was a soldier in the Union Army who was killed during the Baltimore riot of 1861. He is often referred to as the first Union soldier killed in action during the American Civil War. Four days earlier, Private Daniel Hough became the first non-combat casualty of the war when he was accidentally killed by a cannon that went off prematurely during a salute to the flag. Luther Crawford Ladd was 17 years old at the time of his death.