Sir Henry Thomas Tizard FRS (23 August 1885 in Gillingham, Kent – 9 October 1959 in Fareham, Hampshire) was an English chemist and inventor and past Rector of Imperial College. Tizard's ambition to join the navy was thwarted by poor eyesight and he instead studied at Westminster School and Magdalen College, Oxford, where he concentrated on mathematics and chemistry, doing work on indicators and the motions of ions in gases in 1911.