Charles Beck Hornby, DSO, JP (7 February 1883 – 10 January 1949) was a British cavalryman. While serving as a captain in the 4th (Royal Irish) Dragoon Guards, he is reputed to have become the first British soldier to kill a German soldier in the First World War, at around 6:30 am on 22 August 1914, near the Belgian village of Casteau.