Lieutenant-Colonel Henry Hanmer, KH DL (23 January 1789 – 2 February 1868) was an English Tory politician who sat in the House of Commons from 1831 to 1837. Hanmer was the fifth son of Sir Thomas Hanmer, 2nd Baronet of Hanmer, Bettisfield Park in Flintshire, and his wife Margaret Kenyon daughter of George Kenyon of Peel Hall Leicestershire. He was educated at Rugby School and Peterhouse, Cambridge. He became a cornet in the Royal Horse Guards in 1808 and in 1813 was Aide-de-camp to Sir Rowland Hill at Pampeluna and at the Battle of Vitoria. He reached the rank of Lieutenant-Colonel. He was a J.P. and Deputy Lieutenant for Bedfordshire, Buckinghamshire and Berkshire.