George Johnson Armstrong (1902 – 9 July 1941) was the first British citizen to be executed under the Treachery Act 1940. Only four other British subjects are known to have been executed under this Act; saboteur Jose Estelle Key (a Gibraltarian), Duncan Scott-Ford, Oswald John Job (born in London to German parents) and Theodore Schurch. His appeal on 23 June 1941, at the Court of Criminal Appeal, was dismissed, and on 10 July 1941 at the age of 39 Armstrong was executed by hanging at HM Prison Wandsworth by Thomas Pierrepoint.