Lord John Thynne (7 November 1798 – 9 February 1881) was an English aristocrat and Anglican cleric, who served for 45 years as Deputy Dean of Westminster.

[2] On 2 March 1824 at St James's Church, Piccadilly, he married Anna Constantia Beresford, a daughter of Rev.

By his wife he had the following issue: He inherited the estate of Haynes Park, Bedfordshire, and the manor of Kilkhampton in Cornwall from his childless uncle, John Thynne, 3rd Baron Carteret (1772–1849).

Stowe House in Kilkhampton had been the seat of his distant ancestor John Granville, 1st Earl of Bath (1628–1701), and had descended from him via the Cartaret family.

His monument designed by Henry Hugh Armstead, a recumbent effigy within an arched recess, survives in the north choir aisle of Westminster Abbey.