Henry Frederick Thynne, 3rd Marquess of Bath (24 May 1797 – 24 June 1837) was the son of Thomas Thynne, 2nd Marquess of Bath.

He served in the Royal Navy and rose to the rank of Captain in 1822. From 1824 to 1826 and 1828 to 1832, he was M.P. (Tory) for Weobley.

He married Hon. Harriet Baring, daughter of Alexander Baring, 1st Baron Ashburton, on 10 April 1830. They had four children:

• Lady Louisa Isabella Harriet Thynne (d. 1919), married General Robert Feilding, son of William Feilding, 7th Earl of Denbigh and had issue.
• Lady Alice Thynne (d. 1847)
• John Alexander Thynne, 4th Marquess of Bath (1831–1896)
• Lord Henry Frederick Thynne (1832–1904), married Lady Ulrica Seymour, daughter of Edward Seymour, 12th Duke of Somerset and had issue.

Lord Bath died in 1837, aged forty, and was buried on 1 July 1837 at his home, Longleat House, Wiltshire.

Peerage of Great Britain
Preceded by Thomas Thynne	Marquess of Bath 1837	Succeeded by John Thynne

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