Lieutenant-Colonel Henry William Edmund Petty-Fitzmaurice, 6th Marquess of Lansdowne, DSO, MVO (14 January 1872 – 5 March 1936), styled Earl of Kerry until 1927, was a British soldier and politician.

On the formation of the Irish Guards in 1900, he transferred to that regiment while still in South Africa, and was promoted captain on 6 October 1900.

He returned to the Army during World War I, reaching the rank of lieutenant colonel.

Lansdowne was Liberal Unionist and later Conservative member of parliament (MP) for West Derbyshire from 1908 to 1918.

[3][4] He succeeded his father as Marquess of Lansdowne in 1927, with a seat in the British House of Lords, meaning that he had the unusual distinction of serving in the national legislatures of two different countries at the same time.