General Sir Henry Lynedoch Gardiner (1820–1897) was a British knight and British Army general who served in the Royal Artillery and was on the Royal Commission for the Defence of Canada in 1861. He was born in 1820, a son of General Sir Robert Gardiner, and was educated at the Royal Military Academy, Woolwich, entering the Royal Artillery in 1837, and subsequently serving in Canada and in India. There is a photograph of Gardiner and his daughter in the Royal Collection. His diaries – covering the years 1837 and 1839–68 – are held at Cambridge University Library.