Henry Albert Hoy (1855–1910) was a locomotive engineer with the Lancashire and Yorkshire Railway (L&YR).

Hoy was born on 13 January 1855 in London, and educated at King Edward VI's Grammar School in St Albans, and at St John's College, Liverpool University. In 1872 he began an apprenticeship under Francis William Webb at the London and North Western Railway's Crewe works. In 1878 Hoy transferred to the drawing office, where he designed continuous brakes.

In 1884 Hoy moved to the L&YR, becoming an outdoor assistant in the locomotive department under Barton Wright in Manchester; he was proted to works manager a year later. In 1886 Hoy was made works manager at the L&YR's new works at Horwich. He worked principally on electrical engineering.

When John Aspinall was appointed General Manager, Hoy became Chief Mechanical Engineer. His principal contribution was the design of an electrification system for the Liverpool to Southport Railway Line, including motor bogies.

Hoy's only locomotive was a twenty-strong class of troublesome 2-6-2Ts built 1903–04, though he conducted various other experiments.

In 1904 Hoy resigned from the L&YR to become general manager of Beyer-Peacock in Manchester. He was replaced by George Hughes. There he reorganised the works, but died on 24 May 1910.

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• Henry Albert Hoy