General Sir John Philip Du Cane, GCB (5 May 1865 – 5 April 1947) was a British Army officer. He held high rank during the First World War, most notably as Major General Royal Artillery at General Headquarters in 1915 when the British Expeditionary Force (BEF) was expanding rapidly, as General Officer Commanding XV Corps 1916–18, then from April 1918 as liaison officer between Field Marshal Sir Douglas Haig and the Allied Generalissimo Ferdinand Foch. After the war he was Master-General of the Ordnance.