thumb|235px|The first Atlantic locomotive in Great Britain, [[GNR Class C1 (small boiler)|990 Henry Oakley is preserved at York. It was designed by Henry Ivatt in 1897]]
Henry Alfred Ivatt (16 September 1851, Wentworth, Cambridgeshire – 25 October 1923) was an English railway engineer, and was the Chief Mechanical Engineer of the Great Northern Railway from 1896 to 1911.
Career
London and North Western Railway
Educated at Liverpool College., at age 17, Ivatt was apprenticed to John Ramsbottom at the Crewe Works of the London and North Western Railway (LNWR). He worked as a fireman for six months and held various positions there. He was made head of the Holyhead Locomotive Depot in 1874, before being promoted to the head of the Chester District.
Great Southern and Western Railway
In 1877, Ivatt moved to Ireland, and the Great Southern and Western Railway at Inchicore. In 1882, he was appointed to the post of locomotive engineer there, where he patented a design for a sprung flap for vertically opening carriage windows that became ubiquitous.