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.
As of July 2009, Thorneloe is the highest-ranking British Army officer to have been killed in action since Lieutenant Colonel H.