Henry Frederick Thynne, 6th Marquess of Bath ED JP (26 January 1905 – 30 June 1992), styled Lord Henry Thynne until 1916 and Viscount Weymouth between 1916 and 1946, was a British aristocrat, landowner, and Conservative Party politician.

In 1916 he became the heir apparent to his father’s estates and peerages after his elder brother, John, was killed in action in the First World War.

At Oxford, Thynne was part of the Railway Club, which included: Henry Yorke, Roy Harrod, David Plunket Greene, Harry Fox-Strangways, Brian Howard, Michael Rosse, John Sutro, Hugh Lygon, Harold Acton, Bryan Guinness, Patrick Balfour, Mark Ogilvie-Grant, and John Drury-Lowe.

He gained the rank of major in the service of the Royal Wiltshire Yeomanry, fought in the Second World War, and was awarded the Bronze Star.

[3] From 1960 onwards he amassed what would become the largest collection of paintings by Adolf Hitler, numbering sixty by 1983.