Sir Henry Lewis Guy CBE, FRS,[1] (15 June 1887 – 20 July 1956) was a leading British mechanical engineer, notable in particular for his work on steam turbine design.
Following his education he joined the Taff Vale Railway as a student apprentice, and studied at the University College of South Wales where he gained a diploma in mechanical and electrical engineering.
In 1918 he was appointed chief mechanical engineer at that company, a post he was to hold until 1941.
Whilst at Metrovicks, Guy was responsible for many innovations in the design of steam turbo-generators.
[1] During World War II, Guy served on a number committees including the Scientific Advisory Council of the Ministry of Supply.