Air Commodore John Glanville Hearson, CB, CBE, DSO (5 August 1883 – 9 January 1964) was a squadron and wing commander and senior staff officer in the Royal Flying Corps during the First World War, and a senior commander in the fledgling Royal Air Force (RAF) during the 1920s.
Pearson was commissioned a second lieutenant in the Royal Engineers on 31 July 1902.
He reached the rank of brigadier general in 1917, and became the RAF's first Director of Training on the service's formation in April 1918.
Remaining in the RAF after the war, he was promoted to air commodore on 30 June 1923.
Hearson retired from the RAF in 1927 but returned to service in the build up before the Second World War to establish and command the UK's barrage balloon organisation.