Lieutenant-Colonel Guy Percy Wyndham, CB, MVO (19 January 1865 – 17 April 1941) was a British Army soldier.
Percy Wyndham and Madeline Caroline Frances Eden Campbell.
His son with Violet Leverson was the writer and editor Francis Wyndham.
On the outbreak of the Second Boer War in late 1899, Wyndham went to South Africa where he served on the Staff, and was present at the Relief of Ladysmith.
This information, however, ended up on the desk of Alfred Redl, head of counter-intelligence at the Evidenzbureau in Vienna, who unfortunately was the very spy being sought.