Henry Frederick Thynne, 3rd Marquess of Bath (24 May 1797 – 24 June 1837), styled Lord Henry Thynne until January 1837 and Viscount Weymouth between January and March 1837, was a British naval commander and politician.

[1] Thynne was the second son of Thomas Thynne, 2nd Marquess of Bath, whom he succeeded in March 1837 (his unmarried[clarification needed] elder brother Thomas had predeceased their father by two months).

He then served in the Royal Navy and rose to the rank of captain in 1822 after which he transferred to the Signals Corps and did not return to sea.

They had four children: Lord Bath died suddenly in 1837, having been Marquess for only three months, and was buried on 1 July 1837 at Longbridge Deverill, near his home, Longleat House in Wiltshire.

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