Lieutenant Colonel Rupert Stuart Michael Thorneloe, MBE (17 October 1969 – 1 July 2009) was a British Army officer who was killed in action on 1 July 2009 near Lashkar Gah, Helmand Province in southern Afghanistan. Thorneloe is the highest-ranking British Army officer to have been killed in action since Lieutenant Colonel H. Jones's death in 1982 during the Falklands War.