Brigadier Jack Rose Compton Gannon (1 November 1882 – 25 April 1980) was an Irish first-class cricketer and British Army officer. He served initially with the British Army's South Staffordshire Regiment before joining the Indian Army's 23rd Cavalry (Frontier Force). He saw active service in the First World War and the Third Anglo-Afghan War and was mentioned in dispatches. Gannon later served as assistant military secretary to the British commander-in-chief in India before his retirement in 1933. He was recalled to service in the Second World War and was recognised for his contributions to the war on the western front by two further mentions in dispatches and appointment to British and Dutch honours. In retirement he was manager of The Hurlingham Club – an exclusive sports club – and honorary secretary of the Hurlingham Polo Association. Gannon played eight first-class cricket matches for Marylebone Cricket Club and the Europeans.