| Honorific Prefix: | Sir |
| Birth Date: | 1887 6, df=y |
| Birth Place: | Penarth, Vale of Glamorgan, Wales |
| Death Place: | Poole, Dorset, England |
| Awards: | Fellow of the Royal Society, Whitworth Exhibitioner (1908), IMechE Thomas Hawksley Medal (1927) |
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.[2]
Guy was born at Penarth, in the Vale of Glamorgan, Wales in 1887. 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. Guy was a Whitworth Exhibitioner in 1908
In 1915, Guy joined the British Westinghouse Company, (later to become Metropolitan-Vickers) as a design engineer. 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.
Guy was elected a Fellow of the Royal Society in 1936.[1]
During World War II, Guy served on a number committees including the Scientific Advisory Council of the Ministry of Supply. He was awarded a CBE in 1943 followed by a knighthood in 1949.
From 1941 until his retirement in 1951, Guy was secretary of the Institution of Mechanical Engineers. After retirement, Guy was President of the Whitworth Society in 1952.[3]