Major-General Sir John Hanbury-Williams, (19 October 1859 – 19 October 1946) was a British Army officer, who served as Military Secretary to the Secretary of State for War and later Brigadier-General in charge of Administration (Scotland).
He served on the International Olympic Committee (IOC), representing Canada between 1911 and 1921.
During the First World War he was head of the British military mission with the Russian Stavka with direct access to Tsar Nicholas II.