Henry Jack FRSE (6 July 1917 – 5 January 1978) was a Scottish mathematician at University College Dundee.
His research dealt with the development of analytic methods to evaluate certain integrals over matrix spaces.
He was educated at the High School of Dundee then studied Mathematics at the University of Edinburgh (graduating MA in 1940).
During the Second World War he served as a meteorologist with the RAF then resumed studies at Cambridge University, gaining a further BA degree in 1949.
His proposers were W Norrie Everitt, D S Jones, John Frank Allen, Robert Alexander Rankin and Anthony Elliot Ritchie.